For my part, whether I farmed or not depended on my character. On some, I just wanted to level them up quickly and see how a certain powerset combo worked at high levels. Those characters I farmed and power-leveled shamelessly, using any trick or AE exploit I could manage to employ. If other people had a problem with that, I can't really say that I care all that much.
With other characters, I had created a rich and detailed background and/or were leveling up slowly with other players I knew in real life. Those characters would go the opposite route, sometimes turning off XP at certain levels so as to not out-level content. Some people in-game thought it was crazy to level so slowly, and again, I can't really say that I care all that much.
And in some other instances, I wanted to trick out a Level 50, but didn't have the INF, so I paid real-world cash to farmer friends I know in RL (an "unprovable buying gold transaction" in-game, if they're part of your SG).
In short, I'm on the side of "my character, my business, not yours" in the Great Farmer Debate here.