IMO, you *both* need to be vigilant in regards to sliding back into old behaviors. As the WS, he needs to be more so.
I can understand the lack of alone time due to kids, BTDT. But that shouldn't prevent you from setting aside some time for the two of you, even if date night consists of sending the kids on an overnight with family/friends. Or putting back a few bucks each week to pay a sitter one night a month. I imagine most teens would probably do it relatively cheap as long as food and TV time were relatively generous.
The routine my H and I have has changed somewhat but then we're empty-nesters so no kid issues. We've instituted date nights even though they're not regular or scheduled that far in advance, usually it's somewhat spur of the moment, like going to the local drive-in to catch a movie or two.
Bottom line is, BOTH of you need to be on the lookout to make sure you don't fall back into the routine of the "familiar" and comfortable. That rut, for your WS, might lead to another A.BS (Cee64D) 48
WS (Me) 48
Your life is an occasion. Rise to it - Edward Magorium