PL&R, it's an illusion that you will get.
your foot looks like it's sliding on the ground. but it's like...
just a little, really really very little off the ground so it looks like it's still flat there.
it comes with practise.
when i first started gliding, i, too, used to drag my shoes on the ground. wore out 2-3 pairs of shoes because of that. it became a bad habit.
now i'm working on getting it better... i can glide on almost any surface, in almost any pair of shoes now.
same goes for everything... practise makes perfect.
