I'm actually astonished there is so much to do in this game!
I just reloaded my save from just before I went to finish the game as an NCR ally, I've gone off and done both available DLC packs, I am now level 40, and thought right, that's it, Hoover Dam, here I come...
well, after a little bit of exploring first...
Popped into Bitter Springs, and got myself another 3 side quests to do! During which I was given another one at Camp Golf! Looking at my Pip Boy it's reading that I've done 78 quests already! If my memory is right, by the end of Fallout 3 I had completed 31!
I was preparing myself to put this game down for a while and go back to Fallout 3 to pick up the remaining acheivements in that game. (To be honest it's just the "reach level x with Neutral and Bad Karma" ones, and the collect all 20 Bobbleheads one).
All that added to the fact that I still need one more playthrough to allie with Caeser's Leigon and that there are two more DLC packs to come!
Slow? Maybe. Sparsely populated? Probably but you are in a desert... But boring? Nothing to do? Get lost! You just have to find it! It's worth suffering the few minor bugs, (that I've encountered) for this game really.