Yes, absolutely, the ground effect, so named from the reduction in drag when within a half wingspan or so from the ground is about as pronounced as the real thing. It feels very very real, compared with say MS Flight Sim where the effect may be simulated (not sure on this point) but won't cause you to float like you do in X-Plane or in real-life.

I had fun with this in a flight test in a twin once, landing on one engine, with the other feathered and not causing drag, the plane did not want to land. All you can do is wait in this situation. More fun with conventional gear where you can force it onto the ground and hold it there ;-)

Other areas, my recall is a bit hazy, but the corners of the flight envelope, stalls, spins etc., are better in X-Plane.