I use 16 letter or longer all lowercase passwords. They're easy to type and easy to remember. For example, my HN password might be ishouldbemoreproductive. It's hard to crack, but doesn't require finger gymnastics to enter.
Here's a better way to construct a strong, yet memorable password:
Take a full sentence, including punctuation and capitalization. Use the first letter of each word as your password. For example, "I should go on Hacker News less frequently, because I'll be more productive." becomes "IsgoHNlf,bIbmp.". We now have three character classes in what appears to be a random sequence.
(Yes, this still has patterns due to being constructed from English. But we've effectively taken a longer English phrase, with higher total entropy, and compressed it into a string that doesn't exhibit the low per-character entropy of the full words.)
My computer says there are 234979 words. Pick 5 and there are 716382975036689591261090899 combos. That is actually very very close to a 15 letter alphanumeric. 62 ^ 15 = 768909704948766668552634368.
I don't doubt that IsgoHNlf,bIbmp. is a secure password. But it's a bitch to type. Especially on a phone.