Darkmaster,
In fact it does not require you to be good at everything, it just requires that you try, once a friend told me that when we like the game in a way we must teach otehrs to like it that way.
You don't need to be a bluff god to use the bluff skill, you would try and use your arguments, then we roll, if you suceeded, great, if not, bad. You could be the best bluffer in real world, if you don't have a good bluff skill the die roll will show that the thing did not come quite as you like, you were not so eloquent and so on, it is something much more on your character than on you, but I have found out that what we like more is to actually have things that way.
I still use the die rolls at the same things you do, the only difference is that I still want a description, much like this:
Player: Yohr charges to the cockatrice, hurling his body into a single blow, she aims for the head of the creature and screams like mad.
Me: Okay, roll your attack <sums up, he missed> you charge to the cockatrice, giving all your power into the blow, teh cockatrice fits you and stares youre way, you feel uneasy with is eyes fiting you, when you arive the beast moves his head quickly and you try and regain your balance. You will be at -2 AC until your next turn due to the charge.
this is how things work and yes, if overused traps can get rpetty boring for the other players that are not the rogue, but that is something that i actively search to avoid, a trap is there but also there is something for the others to investigate, they can roleplay with their own and so on.
when I say that I ask for the players to roleplay things I don't meant to have them do just that, we have the roleplaying and then the die tell how well it comes, usually before the results of the action,a s shown in my example.
Your concern, darkmaster, is well presented, but I have been able to avoid it until now, i am pretty good at speeches myself and had a characetr that ahd absolutely no diplomacy at all, we were in need of help from a small troop of elves from another region, I made my speech and my companions, the players themselves, were quite amazed and got pretty inspired, the DM rolled for diplomacy and the result came out at a good but not quite enough die rolls, it turned out that my speech was not quite what i liked and that the troop, as a whole, was divided...
From what I have read you seem to do things the same way I do, or so I believe, you may have misinterpreted me now and then though. I don't want anyone to hit the people around the table and that they be experts at the area of their characters, but trying and acting like the character is something I try to make happen, just that, our games are pretty much like a scene made by some bad/ not so good actor and actress... and we enjoy it!
Cheers,
Nif.