Squidward's now my favorite character too. (It used to be SpongeBob.) I like his sarcasm, especially the things he said at the beginning of "Pickles."
Regarding "To SquarePants or not to SquarePants"...
-At first I thought it was a dumb idea, what the plot line was, but those square pants (or rectangular, or whatever) of his are like his trademark or something, so to make and air an episode like this on the ten-year anniversary is rather significant, if you ask me.
-I like how the title music for this episode is the same as "Help Wanted", the first episode! Yeah that sure wasn't done on purpose. =D
-Patrick's being too dumb to remember SpongeBob's last name was too much for me at first (he has done really dumb things in older episodes, though), but at least it's was a plot device for why he couldn't recognize SpongeBob later. Better than the blatant plot device "See how long I can do this", IMO.
-I liked SpongeBob acting like Squidward, including when SpongeBob told that fat fish that he had too many of some kind of burger.
Ultimately, I think this episode was good. Definitely better than I thought. Definitely better than "Best Day Ever." All IMO.