I think he's talking about the freedom when you aim in an fps game compared to the analog sticks on a gamepad (vs a mouse, vs a wiimote)
For me, I think it's about the games you play. For example, I like to play a strategy game like Civilizations, and at the same time chat with people while waiting for the cpu to take its turn
.... or play card games ... or one of those free online games that aren't made by big publishers who can afford to release them on 360/ps3 (eg: kicks online, ultimate baseball online..etc)
Also nothing beats the customization level you can get with PC games. Yes there are some console games that let you install mods and what not, but you can't really go as deep as editing files in the game however you want and just make the most out of that game. Like FIFA for example (let's ignore there are CG and NG versions for now), you can simply edit the game and add as many teams as you like --in a week there were tons of patches to add more leagues/teams-- and there's zero content so far on consoles.
--not mentioning only PC can have dx10 games now (if you're into graphics more than the actual game, I'm not though).