I'm a Ryan Gosling obsessive too.
I found Drive had quite an effect on me, but I wouldn't say I enjoyed it, it's too violent for my tastes these days.
As far as his other films go this is the order you should watch them in and why:
Blue Valentine: Possibly my favourite film. He is utterly beguiling in the younger scenes and Michelle Williams is fantastic in it.
The Ides of March: A fantastic film whether or not you give a hoot about Mr Gosling. There is a scene with Emma Stone, in the bar, that just makes my stomach flip though. Also has George Clooney in.
Half Nelson: Gritty film, probably his best performance but quite hard going and not exactly a perving over him type of film.
Crazy, Stupid Love: Terrible film overall, and I also love Steve Carrell. Absolutely worth it for Ryan's performance as an uber confident woman-magnet. Will make you desperate to try 'the lift'.
The Notebook: Far too schmaltzy for me and don't like his character in it, too wussy and not so attractive.
Ganster Squad: Awful, awful film. Don't watch it, it's not worth it, even when you are a big Gosling fan.
I haven't yet seen: Lars and the Real Girl, Only God Forgives or PLace Beyond the Pines yet, but will offer my opinion as and when I do :)