Security or convenience is a contradiction to make a password. The stronger the passwords we use to keep our data safe, the more steps we take to lock down what we own. To balance both of all, it depends on what the platforms and services you use do.
Multitouch keyboards, in large part, rely on things like character pair prediction and auto-correct to make entry acceptable. Neither of those is possible with passwords, and strong passwords require far higher than normal frequencies of shifting between upper and lower case, and between letters and numbers and symbols. It's the worst possible experience.
A 4-digit passcode lock, or weak password, gets around that by reducing the complexity at the expense of security. Intervals can also be set, so that your passcode is only required minutes after you last used your device instead of seconds. The short interval offers better protection should you lose your device or should a friend try to prank you during an unguarded moment, but it can be maddening if you need to complete a long series of intermittent tasks.
On iOS, ironically, Apple's security policies prevent password managers from working through Safari browser extensions the way they do on OS X, thus requiring more cumbersome copy-paste procedures, or the use of an in-app browser instead of Safari. Some websites, flabbergastingly, use JavaScript to block copy-paste, increasing the difficulty of using strong passwords.
2-step verification requires the use of an authenticator app, or the transmission of a token. Sometimes tokens don't work for no apparent reason, or network connectivity is spotty, complicating transmission. Sometimes it ends up being so secure, even you can't get in.
Personally, you should remember your passwords in your mind. So it is not tough to balance security and convenience. Do you think so?
