Its fun to race around at blast off, and on smaller bodies of water, key areas are important. (So if you get there first, you get that point or whatever.)
Its fun to fish till the last minute, while you are getting bit and race back to weigh.
I asked for a smaller motor when the 19 was purchased. Figured 200 was not needed. Dealer said two things, severe weather you might need the power in big nasty water. And he mentioned resale nobody would want a 19 with 150 and it didn't add much to the total cost to go with 200. So it would be like buying a corvette with a six cylinder. So the boat was bought with the 200.
I propped mine with a slower four blade to stay on pad at slow speeds around twisty sloughs. It still goes 73 on GPS when you open it up. (Probably 69 or so now, grazed a sandbar.) That is going pretty good.
I don't think speed matters that much at all. Steve Sapp rides around at about 45 MPH, and he seems to do ok.
If speed REALLY was the key, ask this question.
"If my boat went twice as fast, would it make me twice the angler I am?" (Would my bag be twice as heavy?)
.02 A.G.