It's funny to me when I see drivers that stomp on the clutch pedal with their entire foot. I don't see how anyone can retain any fine control without the foot anchored to the ground, but y'know, i've seen a lot of videos of rally drivers that drive that way. To each his own; they're better drivers than me so who am i to judge?
As for the question of rev-matching, yes, it's about giving the car gas between gears (when you're downshifting) so that when you put the car back in gear and let out the clutch, the input and output shafts in the tranny are spinning at matching speed and the car's balance isn't upset when the clutch reengages.