Yissssss. Once you get a hang of the various basics, I highly recommend Reika's mods. Very satisfying to play with, if a little dangerous (don't get into ReactorCraft without a test world), and things like Cave Control can make finding resources a little less of a hassle, since that specific one lets you tweak how frequent, and how large, caves and ravines are. Oh, and Mekanism or EnderIO for logistics; the former if you're something of a min-maxer, the latter if you like having multiple pipes in one block space.
This is assuming, of course, that you're using 1.7.10. I can't vouch for anything beyond that because the combat changes are a no-go for me until Reika gets on there and LegacyCraft gets rid of it.