If they just made a little button that said "change format" and opened up the post formats UI that would probably solve about 99% of the problem.

The "smart" people can use that feature and the rest of us can just go ahead and make a post then get on with our lives.

There are many plugins that use post formats like calendar plugins or helpdesk plugins (but the end user doesn't see or have to deal with it). It just works.

When the post UI is right in your face on the post page, it is totally confusing and inhibits posting for the average user. You have to decide which one to pick, how you want something to look and if you even need to pick anything at all?!

Quite a barrier before you even write one word.

If this is ever released into the core (and not a separate plugin), expect a lengthy education campaign. People will just plain be confused.

Developers don't forget about the average user...it could be your neighbor, one of your friends or even your grandmother!