So, the last time I played D3 was last Friday. I got on, did some rifts with some random people for 2 hours and then I logged off. This week I've been kind of busy with school work but with Dark Souls 2 releasing later today for PC, I doubt I will play D3 again for a month or two and guess what? That's O.K. Diablo 3 isn't an MMO. This means 2 things mainly: 1. It won't last you for months and months on end unless you are SUPER into it. 2. If you take a break you can come back and you don't really have to catch up to everyone else.
The game will be there when I want to come back to it. My characters will be waiting for me and when I start back up. I'm sure I'll enjoy it just as much as I have been for the past couple months. Basically, the biggest complaint I've seen levied against Diablo 3 is that it doesn't keep you constantly engaged for months or years on end. I think this is an unfair and unrealistic expectation. Play the game, enjoy it, and when you get bored take a break. There's no harm in stopping.