If you play Dota 2 and like it there isn't much need to really try out LoL, and vice versa. MOBA's are MOBA's and although they are all similar they are also all different, if you like playing one MOBA there really isn't a need to switch to another as it will just be hard work switching between the two games and the subtle (or not so subtle) differences that they have in gameplay.
I tried a bit of Dota 2 and couldn't really get into it because of the differences from LoL but I'm sure if I played Dota 2 first then it would be the same case and I wouldn't be playing LoL
See, that I would probably disagree with. I like differences! I think the main problem would be me having to constantly compare to the familiar. I know nearly every hero in Dota now, but there are definitely heroes in LoL that aren't similar at all. Kayle is sorta like Omniknight, but not really, Teemo's like if Techies if Techies were poison-based and invis (which sounds frigging annoying by the way), and I know for a fact that nobody's like Meepo, since they seem very anti-micro in LoL; Meepo's ult is a passive makes another Meepo per level. If any Meepo dies, all Meepos die. There can thus be up to 4 Meepos... unless you get Aghanim's Scepter, in which case there are
5, all of whom you have to control and make sure don't die. But then there's the obvious temptation of having one bot, one top, one mid and two jungle...
I've heard there are 5 micro-allowed heroes in LoL (one of 'em has a deathy name, Mordensomething), and I've recently taken a liking to playing micro in these games, since I've played no less than two games of all random in a row where I ended up with micro-based junglers in Dota 2 (one as Enchantress, who can take over and directly control jungle creeps and one as Enigma, who can turn creeps of any kind into 3 eidolons who themselves make lesser eidolons when they attack enough).
Any free heroes like that right about now?
...I just said "free heroes". Eugh.