That speed range usually means light air, under 10 knots(my favorite wind range). That wind speed is very often the case in our sailing. At 4 to 5 knots, any angle to the wind, the boat has full power to steer nicely through any seas(off shore, that's important to me), and remains on a comfortable heel that irons out any motion the seas are creating. It's a speed easily handled by our WP, easy for crew to lounge or cook underway(often the case on our boat), so I'm happy to plan 2 hours or even an overnight at that speed. Those same light wind conditions under power if the seas are aft at all, can cause queasiness for anyone prone to seasickness(my wife and daughter). Start sailing though, and that is the cure for them.

This could be one of the many differences between the two types of sailboats I hadn't thought of. The multi has a higher speed range under sail and power(a great attribute), but may also have a higher speed that brings on enjoyable sailing? There is a speed, a certain level of power, that turns a sailboat "on". Meaning, where your 4 to 5 is the point where you feel less comfortable with your boats sailing characteristics, motion and speed? Just making a guess here.

I find that happens to me and crew(more so for crew) on my boat at about 2 to 3 knots. But under those conditions, if I can find a good satisfying and comfortable sail at 3 knots, I prefer to use that speed to then plan at destination. For us, it's the amount of time under sail as much(or more so) than the distance covered, that makes for an enjoyable sailing experience.