Hi there, I am also on a pump and LOVE rollercoasters. Thankfully I did florida for two weeks last year before I started on the pump.
I was however told the magnets on the rides (the vast majority are magnetics) will scramble and deem your pump useless if you use it. My nurse suggested going back on pens if I was to go to a theme park but I havnt had to do it yet. I also though maybe taking it off for every ride but they are expensive and would worry who had it and if being in the park and near these rides with it on would affect it