I've gotten to the point where I have memorized a lot of the bottom times at different depths.
I don't think there's anything wrong with it.I don't think you should memorize the table.
The micro processor has come a long, long way. But it is still infinitely far from being able to equal the human brain. Which is why, if during a dive I have a "feeling" that I should stay a few more minutes at the last stop before surfacing, I do. Because I trust that it can be the amazing human brain putting things together that no computer can. It knows everything - my age, how I'm feeling, how hydrated I am... It actually knows how much n2 is in my tissues, without doing a Doppler test.
Here's some information for historical value only : Some divers have been known to average their depth in their brain (they say it becomes easy with practice), then add their bottom time to there average depth, and use a total of 120 as their NDL. They often change their exit strategy from, "head straight up to 15' for 3 mins", to stopping at 10' intervals for a minute on the way up, and then spending a long time moving up the final feet. No computer, long bottom times and they come out nice and clean.