I played Ragnarok Online too, but I only played in Private Servers. High Rates was fun and addicting but eventually, it gets boring and I quit.
I've been playing RuneScape for 5 years now (on and off) and it's been the best MMORPG I've ever played. The game updates almost every month, almost like Everquest but it loads in Java, making it fast to download and playable anywhere. The questing is great in this game. $5.00 a month will get you 10x the extra features.
The game that I'm playing now is Eudemons Online. Sort of like Pokemon, where you raise creatures that can find with you, but also an aspect of Ragnarok Online where you reborn the creatures to improve their growth rates, making them stronger.
It has a really fun aspect but the world is too small and the game doesn't focus too much on questing. Just a kill fest game.
If I could find a new MMORPG, I'd give it a try. I haven't found one where I can get a kick back for playing so long.