I'd say the question doesn't "match" the poll answers too.
For me, it depends on the light. I buy some lights, just to play or to try out a new manufacturer, new emitter, etc. Usually cheaper model lights which I sometimes will give away to friends or family once I've had my fill of it. For these, I don't bother memorizing UI, I learn enough to play and that is is. Sometimes I strike gold and I decide, this light is worth keeping, then I will memorize more details. This happened for example with my LF2. Big hairy UI, but the light impressed me so much I was willing to take the time to learn it. There are a couple lights that I've bought with UIs so bad that I haven't given them out.
Then there are lights that I buy for my personal use. I usually prefer to have KISS lights here. Something that will work immediately without any time for rational thought. Push button for light, push harder for more light is my favorite. I do generally arry a multifunction light around with me as well for blinking signal whatever. Generally this is a photon proton, LF2, LF3. The Proton has an incredible UI, and I've spent the time memorizing the LF twisty UI so that I can access the basics without much conscious effort.
So I'm a mixed bag. I try out new stuff that I really won't put much effort into memorizing, I shop for and use KISS and give a couple more complex lights a chunk of memory.
With a couple exceptions, most lights work reasonably well even if you don't know the UI. So I don't consider UI to make or break a light as much as other factors like price, availability, durability, batery type. But it does affect my high end purchases. I won't pay $200 for a reverse clicke cycle mode light, even if it is bright and made of Ti.