I've tested this at lower levels with people I knew, just to test the bots viability...
The answer is no, definitely not in the AFK sense. Doing MoP heroics with Dungeon Buddy is well out of the question at this time. Well, the bot works, technically, but people will know you're a bot VERY quickly, which leads to a ban.
This is more meant for a group of 2-3 people than can do the instance by themselves, while letting another char come along and roll on loot they need.
However, if you're facing a 20 mins queue for a 5 man heroic, you can turn the buddy on, it'll accept the queue for you, get you in and get you started. A few plugins will give audible warnings when that happens. In the meantime you can make dinner, watch porn, or play LoL...
While DungeonBuddy may eventually be able to run a 5 man heroic with a pug, while acting like a human player, it's not there yet...
-sk