Our daughter just started college so right now we are out more!
When I was pregnant, we made sure that our weekly date night would not be compromised unless someone was sick, etc. We continued weekly date night and we still go on weekly date night. We feel it is important to maintaining a good relationship.
We put that weekly $$ in our budget, we had good sitters and we paid sitters about $60-$100 a week for our date night.
When our daughter got old enough, she started babysitting for others and she usually babysits at least 1 night a week and brings in at least $60-$100 a weekend night (or day)... dates can be daytime too!!
As for alone time, I was in a neighborhood bunco group about 10 years and we played once a month, I lunch with my best girlfriend at least once a week.
I know it is tough and expensive to make it work but we felt like it was a priority for our relationship and so far it has worked... daughter is almost 19 and we've been married 25 yrs.