Our experience with Atlantis was okay. Sure, there was an A-Gay type crowd, but I didn't care about them. The entertainment was mediocre, but the food was good enough. I thought that the shore travel was awfully expensive.
My mom and I once went on an Alaska cruise, straight, and I can't say it was much different from the gay cruise. Instead of A-Gays you had loudmouths. Not as pretty, but the scenery was superb!