I got into it over the course of 2013 whilst watching it on TV with kids I was babysitting. I was bemoaning my fate up until Squidward bemoaned his fate (or remarked on the intelligence of SB, or something) and I busted up laughing because he said exactly what I'd been thinking at that moment. I don't remember what episode it was, but I simply adored Squidward's sarcasm and general abrasive nature, not to mention, an artist. By now, I DO like most of the characters, but Squidward still never fails to be his wonderful, grouchy and cute self.
Oh, by "bemoaning my fate", I mean because I was stuck watching a show I'd avoided like the plague all these years. I was NOT a fan. But, now I love the show and wonder what was wrong with me all those years. ;)