I just got back from seeing it as well. I had sped through the FOTR since I had to finish it by the time I sqw the movie, so I did miss a few things, but not enough to make any real impact.
My impression is: This movie is simply incredible. In some ways it is even better than the books, mostly in displaying the awesome power of the battles, or the balrog (my favorite part of the film was seeing the balrog for the first time; I was completely blown away.) I am in awe. The special effects are simply gorgeous; for the most part the acting is brilliant. IMHO, I think the guy who played Frodo was a bit too femmy, but thats just MO. Also, I didn't like having Agent Smith as the elf. He's just too evil a person to play such a benevolent character. Elves are not supposed to sneer when discussing the beauty of their land. Otherwise it was perfect.
The humor was sparse and did not detract from the movie at all. Rather it added to the drama. Very artfully done.
Oh yes, and the horse chase scene with the Black Riders was absolutely fabulous. Even though I dont like horses, I loved that part. When the Black Riders almost catch them, and she tells the horse to hutty up, and he starts to sprint harder; I know exactly what that feels like! I run XC, and I know what it feels like to be giving 110%, and then have to give another 10% just to win. That is exactly the feeling they conveyed with that scene. Simply beautiful.
I really dont what to say, other than: if you havent seen this yet, you will not be disappointed! (BTW, just so you know, I thought the books were "good," but I am not an obsessive fanboy. So this is the review of a fairly impartial viewer.)