There are many concert pianists who use "tricks" in some sense, it's a reality. But I have never yet met a great concert pianist who is really "cheating". They think very practical and adapt themselves as well as possible to the performance situation.
One of the most remarkable "tricks" I encountered, which actually almost borders on cheating: Alicia de Larrocha's interpretation of the Prelude (Asturias) from Albéniz' Cantos de España. I have listened to that in slow motion, and clearly she does not play the notes that come after the chordal leaps like they're written. I haven't yet figured out what she actually does, but she definitely changed the text in order to reduce the gap between the chordal leaps and the continuation of the melody!
from 0:36 in this recording.
Does this take away anything from her great interpretation of this piece? I don't think so. But I, for myself, don't use this "trick", I rather play the piece a tiny bit slower.
Another "famous" trick: the octave leaps at the beginning of Beethoven's op. 111.
Many pianists share them between the hands, for safety reasons. This does not at all change the text, it just makes the leaps more safe to play. But there are pianists like Arrau who would never ever do that. Arrau says that technical difficulty, as intentionally written by the composer, expresses a musical value per se! So, pianists who think like Arrau would consider this arrangement of the octaves to be cheating.
I don't think it's cheating, as it doesn't change the text, but nevertheless, I chose to play the octave leaps with the left hand alone.
And I remember another one: Horowitz' chromatic octaves in the coda of the first Chopin Scherzo op. 20. Chopin wrote them as chromatic scales in parallel movement, not as octaves. Arrau says that it's much more difficult to play it as written, with all the accents on the first count, and he leaves no doubt that he doesn't like Horowitz' "trick" at all, I think he considers it to be some sort of "show-off"
Well, I personally find the octave version way harder...