I just started watching grey's a little while ago, and i totally love it. but i'm only on season 2 and it's taking forever getting caught up, so what episodes should i watch where major stuff i MUST SEE happens in?

I wouldn't advise you to miss any episodes ( especially not the two hour season finale of season 6 best episodes ever), because there are so many things going on in every episode and they are really fun to watch. But if you would like to catch up fast there things like the starter kit's for greys. They each give you the most important things to know for the next season!

Every episode is good and you have to get caught up because they refrence past episodes. It's a good idea for you to keep watching until you get caught up.

You should definitely not miss an episode. I just recently started watching GA myself in August and I just had to buy all the seasons! I ended up finishing all the seasons just in time for the season 7 premiere and it was worth it. =D You definitely wont regret watching every episode.