Happy Early birthday.
My i s c & a aggie wife and I don't ever do anything for Valentines for all of the above-mentioned reasons. Dinner out is a bad deal and a bad time, flowers are way too expensive at this time (and at Mother's Day) so I skip the flowers and buy them on many other occasions.
However, our kids really like it, so we give them small presents and candy, and help them make or buy cards/gifts for their friends. It's pretty cute how much they get into it, especially given how little we've ever stressed it in our lives. Apparently Hallmark has ways of getting to them, without our interference.