Yes, definitely.
If/when (more of when, though, really..) you get bored of it there are tons of pretty easy-to-install mods that increase the longevity quite a bit, and they're usually compatible with multiplayer!
There are also a lot of SERVER mods, so you can play with a vanilla client and have an entirely different experience on many servers.
You can play a basic "creature" mode on your browser, for free, that's the game in a nutshell. If you want more blocks, a little bit of a challenge.. well, the full game is definitely for you!