false. in almost everything you said.
first off, bowser's wavedash actually has considerable distance, its got a slow startup sure, but watch a match of mine and see if i can apply it correctly
that "situation where waiting a half a second to grab" is faster? out of sheild, say a marth fsmashes you and you shield at significant range, you cant simply sheild grab, you can likely land the wavedash out of sheild grab, if your timing is a little off he can spotdodge, but sometimes you might as well wavedash out of sheild and fsmash in case he spotdodges eh?
poor marf ;P
dont tell people NOT to learn wavedashing thats ridiculous.
alright the reason bowsers is "harder" is because you are used to the timing of the characters with faster jump animations, slow everything down and learn from scratch on bowser practice just jumping and airdodging down until you get the timing then add the left/right. wavelanding is still the same as always though (and thats whats REALLY important for bowser)