I have a Samsung 840 EVO 120gb as well.. Ive had it for about 2 or 3 months now, using it every day. The total writes at this point is 0.50 TB, so 500 GB, which seems to be not much ^^
The thing I do, is I've put all of my data on the 1TB HDD I have, downloads go to there, desktop is on there... pics, video's everything. Only the os, software and like 2 games on the SSD