Don't feel that way. I initially had to jump on the bandwagon and have a nice, link-filled README on my profile, but I ended up removing it all. The profile page is already good. It has your avatar, a short description from your profile, your group memberships, a list of your repos, and a good graphical representation of your work on Github.
It is a github profile, after all. A personal webpage is better for all the other information about you, and you can just put that link in your profile description.
It's a new addition, so I'm giving it time to see how it's going to be used in the wild and although I kinda like OP's take, the ones with giant images, GIFs, too much text... I'm not so sure. Maybe it's just like this now because it's a shiny new toy and people are pushing its boundaries but will die down later.
I'm lightly skewing towards just hiding it with a custom rule and forget about them. I visit a Github profile to quickly see what the developer codes instead of a showcase of their personality which, as you said, would be better served by a personal website.
It is a github profile, after all. A personal webpage is better for all the other information about you, and you can just put that link in your profile description.