I’ve had a few people ask me which AddOns I use, and I think the following screenshot lists most of them. Click for high res.
I use the Curse downloader to manage my add ons. I recently upgraded from 3.0 to 4.0, and I must say there was a huge improvement. I also sprung the few dollars to get Curse Premium, and I have to give them 5 stars. It works great! My only gripe so far is that the AddOn sync doesn’t work with MacOS version yet (I have a PC Desktop which I usually play on, but WoW is installed on my MacBook Pro as well), however, the MacOS version is in Alpha, and you don’t even need to have Premium to use most of the features (including Update All).