auto-aim or aim-assist make shooters quite a bit easier on consoles. also console shooters move slower because of the imprecise thumbstick controls.
driving is much better with a console controller though.
some console games just give up and punt, giving you lock-on targeting.
someone already mentioned the memory limitations putting a limit to onscreen enemy count (Dragon Age Origins).
Demons Souls is a bad example. It isn't all that hard. The only difficulty is the poor controls & console controller input. Beyond that it's all pattern memorization and the patterns don't get all that difficult.
Overall I wouldn't say PC games are more difficult. There is just a much wider range of difficulty in PC games. There are some that are insanely brutal and unforgiving and there are some that are as easy as a typical console game.
EDIT: big push in high $$ console games to make them more "cinematic experiences" where even a slightly retarded spider monkey can finish them with around 500 "achievement" points. Not helping the case for good console games.
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