Co-Op Quandary

As a 30-something with a family, full-time job, & commitments that come with age, I find it so difficult to find and coordinate time to play co-op games with my friends, Pragmatic and Trimetric.  Those happen to be a favorite style of gameplay & the combined experience makes it that much more fun.  I'm sure there are many in the same boat, but it is a frustration.  We end up basically scheduling marathon sessions every now and then & burn through games like Halo 3: ODST and Halo 3.  I'm very happy that the genre is getting better at formulating fun, rewarding drop-in experiences.  Borderlands is one we've been trying to get through for months, and I love playing the game.  Oh well...not really looking for answers, just a little wish-I-had-more-time venting.