I do not mind it and usually drink the sugar free variety. I would estimate that I intake 2-3 of the small cans per month on average. The only time I drink more than one in a day is usually on long road trips (10-12hrs) as I find that my coffee cools too quickly while I am driving (kind of forget about it while I concentrate on the road or converse whith a co-pilot), having redbull allows me to just sip on it instead of having to gulp down a coffee before it cools off (cant stand the taste of cold coffee).
To throw it out there, why not try 5-hour energy or equivalent that aren't as spiky in their stimulant capability?
I've tried 5hour energy twice, and for me it is as advertised, it does seem milder than a cup of coffee for a longer time, and without the crash.