I occasionally got the "Adjust vertical speed" or "Monitor vertical speed." Fortunatey never got the corrective and increasing RAs which get a little dangerous as you start to enter the realm of cabin movement.
I'd like to clarify some points you have raised about TCAS:
1. "Adjust vertical speed, adjust" is a corrective RA. "AVSA" requires a reduction to 2000, 1000, 500 or 0 ft/min, as indicated on the instruments. Any RA that requires a change of vertical speed is corrective. Incidentally, it's very often incorrectly flown (pilots increase the vertical speed instead of reducing it). This RA will be replaced by a new "level-off, level-off" RA (reduction to 0) in the forthcoming TCAS ver. 7.1 (implementation date still not known).
2. I don't think you're right saying RAs "get a little dangerous". They're not if flown correctly. Climb/descend RAs require vertical speeds of 1500 ft/min, increase climb/descent 2500. The former requires acceleration (positive or negative) of .25G, the latter .35. What is a bit dangerous about it? In my book that is a normal aircraft operation.
3. Whether RAs are rare or frequent is airspace depended. In some places they occur as frequently as every 40 flight hours, in other every 2000. Simply: complex, congested airspace = more RAs.