We do both.. I am a SAHM, and DH works very hard. He gets about 5 weeks of vacation. He loves Montana, we are building a cabin out there. So every year he goes out there for 2 (this year 3) vacations, one week at a time. He rides his motorcycle, and works on the house. One of those weeks, DS4, DS6 and I join him for a family vacation. ( Right now, I don't WANT to be out there for 3 weeks!) We all take a yearly trip in the fall to WDW. This year, I am going to WDW again-by myself. (My mother is watching the boys, DH would be lost!) We spend family time on the weekends on our boat, and at the community pool.
I see no problem with couples taking separate vacations, as long as they take some vacations together. Everyone needs some time to themselves. And although I miss DH while he's gone, it seems that I get more things done while he's off enjoying himself!