pwc's are always a concern in the south here as well.
IMHO,,, no blame can be placed on the machine itself. modern 'jet ski's' are as fuel efficient as anything, the 4 strokes are next to silent, spew no oils with their exhaust, they use 'jet drive' as not to chop up the manatees we have with props, very little draft to minimize damage to anything they hit, coral and stuff, much less than any skiff.
and there are problems as well,, parts,, forget about getting them 'in country'. and as someone else said, they are annoying. why? because people tend to get crazy on them because it is fun. plus they never really leave the area, they don't go anywhere, they just go round and round.
if there could be a designate pwc area, it may not [#%!] off everyone else.
the entire problem with pwc can be placed on the operator.
again,, just my opinion!