My first experience with anything Realmsian was when, being bored one day, I bought R. A. Salvatore's Homeland and thereafter kept reading Drizzt books. Eventually, I branched out to other Forgotten Realms books. Considering they were probably the widest series of novels (aside maybe from Dragonlance) I never ran out of material.
I staunchly drew the line at buying the material though. I didn't run a Realms campaign, ergo, I felt no need to buy Realms stuff. Slowly but surely however, it sucked me in. I'm a sucker for intricate details and evolving happenings with those details, and the Realms has that in spades. I eventually found myself buying the scant odd Realms product every now and then (most notably being the "big three" that was Faiths & Avatars, Powers & Pantheons, and Demihuman Deities).
With 3E, I felt like I had a new start with the Realms. It was a new edition, a time of new beginnings. I picked up Monsters of Faerun, Into the Dragon's Lair, and Pool of Radiance: Attack on Myth Drannor and liked how they turned out. So, mind made up, I picked up the new Forgotten Realms Campaign Setting and didn't look back. I haven't regretted it since.
That said, I do sort of regret that the Realms are now my only place to go for intricate campaign detail. Other worlds used to have that, but WotC's new policy of "do it your way" led to them having a much more laissez-faire style towards their campaign worlds.
I also liked the fact that Abeir-Toril was host to such a diverse world. It wasn't just Faerun, but also Zakhara, Kara-Tur, and Maztica. I liked the idea of them (and I liked what I saw of their actual production also), since they truly fleshed out the idea that this was an entire world, with whole regions that were so different from each other and didn't have to always have something to do with each other. That was truly great, and I miss it a lot in 3E.