It would appear - by most accounts - and observations on this thread - that there is no true benefit - to having these dock spaces reserved for H boaters. There is no benefit to the handicapped person as s/he still has to figure out how to get out of the boat and up onto the dock, and then wheel her/himself down the dock, etc... The ONLY real benefit appears to be that s/he gets to dock faster than most who must wait for the docks to open up.
Its certainly an interesting conundrum!