I think that I've already posted this somewhere, but I find scales to be of infinite importance. Every day, I practice half an hour to 40 min. of scales, arpeggi, broken chords, double thirds, chromatic thirds, sixths, octaves, voiced chords, solid chords, broken chords, 2/3, 3/2, 4/3, 3/4, etc. Legato and leggiero - 8ths, triplets, sixteenths. It makes things a lot easier when I get to my pieces and saves time. Each week a pick a new keys going around the circle of fifths. Scales are in the tonic and chords in the dominant.
The other reason that these are important is that they must become second nature. When this happens, once can monitor in warm-up (so to speak) things like breathing, hand position, posture, and the like. I think that aside from etudes, this daily regimen is what keeps my technique in shape.
Best,
Michael