Allways something new to do and/or try. Different leagues and new one coming once in 3 months or so keeps me entertained.
Been playing this game since ACTs were only 3-4, just now started to play thru Steam so my hours played are _much_ greater than shown.
Might be scary to new players but if you do not try to learn that big and scary skilltree but watch some videos and PoB, you will learn much quicker. PoB = Path of Building where there are lots of "done" characters you can try and play that suit your style. I recommend this year after year, now clets hope PoE II is good also, so far seems like it will be.