Like may on FM i have a number of pins, and I use a pin for most of my fishing where i can.
I also have a Richard Walker Mk IV carp rod, i use it now and then with a pin floater fishing for carp, great fun, and very simple.
Sliding float, Ledgering, etc etc, using a pin is simple and no great skill is needed. Casting will get better the more you use a pin, it's like most of angling, the more you practice the better you get.
Your direct to the line, so there isn't that split second you get with a fixed spool reel, when you turn the handle or flicking the bale arm over, which may result in a lost fish due to a fraction of slack line that can sometimes happen.
The best pin I ever used has to be a Speedia Wide drum, some of the new pins i have had, just didn't come close. As with lots of tackle it's each to their own.