@RumbleFish I'll throw in a few comments, now that you mention speeds. Background: Sailing in a slow monohull. Had some speedboats in the salad days but only as day boats.
If I were (will be?) buying a 40' trawler, I would probably just look for a "slow" trawler. I like protected running gear, and probably wouldn't use faster speed that much. Of course I'd have to see what was available at the time.
But for something around 30', speed (to be used at specific times, not all the time) sounds more interesting to me. Thinking of the Chesapeake and maybe the Bahamas, the first thing that comes to my mind is shallow draft. I like to gunkhole and I like to poke into shallow, well-protected anchorages. So shallow draft would be important.
Back to speed though: I ended up with a boat that can go 20 knots. I still cruise at 6 knots most of the time, but the speed can be really handy. For example:
1) To make up for the "less seaworthiness" (or just the less comfortable ride in seas) of the boat (so this is a bit of a "cycle" since the boat is less "seaworthy" because of the design factors of being smaller and capable of going faster). I don't mean that I go out into wild seas or bad forecasts; but for example I can slip across a sound or part of a great lake during an early morning calm weather window in much less time going 18-20 knots than I would at 6 knots. Gives me options.
2) To spend part of the day doing other things, knowing I can get to my anchorage before dark just by going a little faster. This works especially well if I have a known anchorage to head for (I can spend the day on a hike or swimming or reading, knowing I only need an hour or so to get to the anchorage, not 4-5 hours.)
3) If cruising from a fixed base (slip), it allows exploring new areas more often (larger range).
I still trawl along most of the time though, sipping fuel and enjoying the slow pace
Of course there is no free lunch; my boat is decidedly smaller and less comfortable than a larger trawler. But that's down to boat design and there are plenty of larger, more comfortable boats that can still go fast, or fast-ish. I still think if I were going full big trawler, I'd just plan on 8 knots or whatever. But in the 30' range, I would consider some speed. At least as an option when looking at potential boats.