I like simple too. So simple in fact, that I do not even like a high/low on my lights when possible. On my Surefire P2X and P3X lights I opted for the tactical tailcaps. Press momentary on at 100% , full press constant on at 100% , press again for off.
I like them that way because I use them that way. The most complicated light I have is my Emisar D4. It is easy to remember all the modes and clicks on it, but sometimes if my timing is too fast I get blasted at close range with a 4,300 lumen bounce back, not fun. I actually like to carry it unlocked and in tactical mode when I am outside after dark. Just press for momentary 100% until my finger burns, about 10 seconds.