Luckily for most people, on a private network, personal computer; most browsers offer some sort of auto-fill password system. For those accessing from multiple platforms, apps like OnePassword, are awesome. There are other free alternatives out there as well.
For those of us using MacOS, keychain (if I'm calling it the right thing) not only generates secure (and ridiculously complex) passwords, but also auto saves/updates it across the entire platform.
While I agree that this is tedious for a forum, it's better to never be hacked in the first place, as most people use the same or very similar passwords across multiple sites. No one wants a simple forum hack to lead to compromised banking information due to a shared/similar password.