I don't use one bill pay service to pay all our bills. Instead, I keep a folder of links to all the credit card websites I log into to pay bills. My bank has a billpay service where you can plug in all your bills and have it set to pay everything directly out of your checking account every month, but that feels too automated to me and I like having more control over my finances. I like to sit down every two weeks and review bills and look over logs. I never kept carbon copies of checks, I would order checks sans carbon paper, because I always wrote down in my roster the date, the amount spent and where it was spent at the point of sale. It was a habit my parents instilled in me and I'm grateful for it.
I set my home utility bills; water, garbage, PG&E to auto charge to my main credit card every month. The phone bill, netflix and my daughter's health insurance payment , AAA membership, home insurance and car insurance also auto charge to that card when they are due. (Some of those payments get charged annually.) At the end of the month, instead of paying all those bills separately by logging into the pge website, the city water website, the local garbage company website etc, I log onto my credit card website, review all the charges, then pay the one large payment online via a one-time only bank to bank transfer. I don't have the card set up to auto draw from my checking account. I like to review the charges before I ok payment in case there is a dispute. That way I only have one payment confirmation number to write down. One "e-check" and all bills are paid.
I like doing it this way because all my bills are all in one place where I can see them. I have the option to contest any charges I disagree with (though I've only used that feature once when an online merchant didn't deliver goods I had ordered about five years ago) and by using the card to pay off all bills instead of paying directly from my checking account, I accrue cash back points from the credit card issuer that I can turn around and use to pay off a bill. Free money? Sure! I'll play that game for free money.
I only write one actual check a month. The check goes to the bank that holds my mortgage. I don't know why I like to continue to pay it analog style, but I always have and probably will continue to do so. It's just a personal quirk.
I don't use the same credit card for everything though. I have a small handful of cards that I use for various reasons. The household bills and are all charged to one card.
I use an American express Costco card that is used for food and gasoline purchases. For using that card on gas and groceries at Costco I get cash back. The card is paid off at the end of the month so no interest is ever accrued.
I have an Amazon visa that I only use when I shop at amazon.com. I get maximum points back for using that card at that merchant and can turn around and use those points to pay off part of the card. That card is also paid off in full every month so as to not accrue interest. I mostly use amazon.com to buy household items and cat food. (They sell it cheaper than my local pet store and if you buy in bulk you get free shipping.)
I have a target credit card that I only use at target that gets me 5% off when I shop there. It's rarely used but when it is, I log into the website and pay it off as soon as I get home. I only use it for the discount.
I have one card with a very low interest rate that I have some debt parked from the last couple of years of job loss and subsequent underemployment. We had to charge our property taxes for a couple of years so it's built up to something I'm not quite comfortable with but it was a better option than not paying and losing the house. We've managed to get 0% balance transfer offers from our other cards that are just sitting there unused, so we've had to bounce the balance a couple of times until we get into a better position to be able to pay it off. We're making headway on it, albeit slowly.
Long story short, yea... it's a juggling act but if you play the game right, you can get cash rewards. And paying by check for everything doesn't net you anything in return and is a bigger hassle than just logging onto one credit card site, looking over the list of charges, then paying that one bill. If I want to see an itemized list of how PG&E got to their decision to charge me what they did, I can always log onto their site directly and download a pdf version of my physical bill so I can see how much gas vs electricity I've used and how much of that bill went to taxes. Since my bills don't jump around and stay fairly steady month to month, checking the details isn't necessary, but it's nice to know the option is there. I've gone paperless for all bills except my mortgage. It's just so convenient to have it all stored digitally so I could whittle down my poor bloated filing cabinet.
(As you can probably tell, I handle all the bills in the house. When my husband did it, our account was overdrawn nearly every month. I got fed up and fired him as our accountant. He's an amazing guy, but he can't balance a checkbook to save his life.)