Not currently, but have several times in the past. At the moment, my tanks are coral tanks.
My 240 may become a Fowler if I get around to ordering my BIG tank..
Having a skimmer and sump make anything you want to do easier (IMO). The ability to potentially oversize a skimmer for a tank that has big eaters (and subsequently big poopers) like triggers, groupers, large angels and tangs alike necessitate a skimmer. Could it be done without. Absolutely. But in all the years I have been keeping tanks large or small, the more tedious the maintenance routine is, the more likely things will be put off or not done at all.
Having a skimmer is a step in maintaining better water quality for our fishy friends and making things like water changes, changing carbon, etc. less regimented. Not that I am saying not to do water changes, quite the opposite, but if I had a Fowler with large fish with large appetites and no skimmer, I would be doing large regular water changes. By removing dissolved organics, which is what a skimmer does, things like carbon can be more effective and changed less frequently.
A sump is something that allows flexibility in many ways. A place for a skimmer, reactors etc make it a no brainier for me.