Yes, I did earn my Cherry Inferno Achievement by bombing over 119 folders in 1 hour. I wasn't trying to get it at the time, I was having my happy hour and rushing to bomb my friends and family and those who comment as fast as I could.
I usually bomb the folder with the most files to get them and me the most points. This leads to a lag as the cherry bomb needs to refill and u have to wait to bomb again, this slows u down. You might wanna try bombing folders with just a few pics in them. This way the cherry bomb won't take long to refill if at all and you can get more folders bombed in an hour. I wasn't bombing the smallest folders when I started my bombing. I had to wait after, to refill the bomb and would click back and forth between someone, that I wanted to bombs, folders to refresh the screen. This was a strategy I used to get to bombing the persons folder as fast as the bomb refilled. At the end I was bombing small folders and after being asked how I did it by several people I thought about it and decided that the advice I think will help you the most, is to bomb folders with small amounts of files more often than large folders. It's the only thing I could think of that might help you.
I'm not sure this will help any of you in your quest to complete this achhievement, but it's my best guess in how to do it. Like I said I wasn't trying for it and just lucked out in getting it. I wish you all good luck completing the Cherry Inferno Achievement! :)