I use a password manager and still have embarrassingly simple passwords for some things. The reason is that the most common place I'm "typing" this password is an obnoxious interface like a gaming console.
Data source is a python script which trolls through /usr/dict/words and then counts the occurrence of each three-letter alternating-hand combination, outputting the counts. To start I pick a letter with 1/26 odds, then filter the triplets based on first letter, then continuously pick triplets based on the last two selected letters.
(I think this amounts to a Markov chain but I've not studied them well enough to know for certain...)