I have a Galaxy Tab 2 7.0. I'm guessing I would prefer higher resolution display and speedier processor on the Nexus 7, but a few things weigh in favor of the Galaxy Tab
MicroSD expansion - on 8GB device with Android OS, you only have about half that available for storage. 2 movies from Google Play available offline filled my Tab. So having 16GB in microSD allows me to store a mess of movies and music. For travel, I can watch movies, etc., where cloud-based media would be impossible (or $15 per trip over in-flight WiFi)
GPS - I don't use it a lot, but when traveling I tether to my iPhone as a personal hotspot and you can't beat Google Navigation on 7 inch display. Quite nice.
Rear facing camera - yep, I'm one of those people who takes pictures with a tablet. Much more often than I use the front facing camera, in fact. Also nice for augmented reality apps, etc.
IR port - only just started playing with the Peel app and the IR port, but it now genuinely replaces my Logitech smart remote.
Sometimes app transition could be a little speedier, but in-apps I have no complaints with dual core on the Tab, games and Netflix run just fine, nothing else taxes it.
So, no buyer's remorse from me. If I was buying one today I might go with the Nexus 7 just because I'm a cheapskate, but I don't regret dropping an extra $50 on my Tab 2.