I agree, it's much easier controlling both aircraft and helicopters using HOTAS (not that I hit the pad every time in EECH, but that's another story :D )
Not to mention that it's much more fun to fly with HOTAS! I didn't think it mattered as I have had HOTAS for as I've been playing real sims (since I got Flanker 2, and gave up IAF and F-22 lightning :) ).
But when I got this "Logitech Extreme 3d pro" thingy with a small throttle and twist handle for my old computer at my dorm, I noticed how much you lose of the feeling of flying. It's not even close to even the X-36 I got at home.
The difference between a Logitech or Microsoft joystick and a HOTAS, is almost as evident as the difference between keyboard and a joystick! (No not really, but you get my point)
/Axl