For me, this solely depends on both the song, style, and more important, the audience. However, I must admit that I enjoy many of the full intros, and some really fit certain songs. With some other songs, I might just open with a fill or even a break.
Cheers,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)