Well, much of what people like is what they are used to, and I am used to the feel of large jets, so I find the control feel of jets to be very good. Boeing aircraft have a very sophisticated control system that does indeed take aircraft speed into account. At low speeds it feel more "mushy" and more firm at high speeds just like a "real" airplane. The rudder also automatically programs from high to low authority as speed increases. Of course this is all artificial through the use of the hydralic control system and inputs from the Air Data Computers. One "real" cause of this change in control feel is the fact that the 767 has both inboard and outboard ailerons. The outboards are only unlocked below 250 kts, while the inboards are always in use. I kind of disagree that flying larger planes is all "by the numbers". Of course we use strict speeds for different phases of flight, but that is due to the fact that our wieght changes much more than in a light aircraft, often my 200,000 lbs or more. But even so, you have a "feel" for the aircraft just like in your 150. I've often noticed a very small vibration or an odd way a control feels compared to another plane just like you would in a light plane.
Anyway, I hope I haven't been too long winded in my answer!
Mark