My 36' ketch
draws 4.5' and I have gone aground four times. Once was while waiting at a drawbridge on the ICW
north of Fort Lauderdale
. I had to wait for the tide to lift
me off. Another time I had to be towed by BoatUS and I was right next to the channel marker!
Most of my sailing is on the Gulf of Mexico
side of Florida
but I wouldn't consider over 5' draft. Even with 4.5' I bump often including in the marina where I am familiar with the layout.
7.5' would be very limiting for this area.