We have gone camping every year of my life and my kids lives so far :-) For a week at a time...
Until they are about 3 I still take the pack and play for the little one... They are not expected to stay in it for naps (usually put them on one of the bigger airmattresses) But at night its nice to know that they are not rolling around the tent bumping into heaters (if its chilly enough for one.)
If your munchkin is a restless sleeper (mover and roller) and WILL not stay in the pack and play then I have pulled them in bed with hubby and I. I know where they are, and that they are warm /cool enough...
I also put my bed closest to the door and inbetween the kids and the porta potty we take with us and keep in the tent... :-) Hey, you should see it... Our camping get up has been equated to the "palace" of camping... Guess noone uses tarps to make their "compounds " anymore...
Little hint from experience... Rainflys DO NOT work. Tarp over your tent to really keep dry. If camping for an extended time (more than a weekend) then set a screen tent up a few feet infront of your door and tarp over both tents with one tarp... Instant play area in rainy weather and dry cooking area if needed...