[thwarted]

Only power users are going to bother clicking a button just to help them fill in a form, or even know that's what the button does in the first place.

This is an interesting observation. I never used the "wand" function in Opera because, partly, it's named in such a way as to not appeal to power users at all. The name "wand" says "do something magically". Agreed that "wand" doesn't indicate what it does, which is another reason to shy away from it. It's such a generic term as to be useless. Literally anything could be behind the "magic" operation.

[takeda]

I don't care about name, just the functionality. It could be called Secure Login, Autocomplete or other things. As long as it works correctly.

Another thing I forgot to mention which is quite important. It works well when your password store is encrypted. It allows browser to ask you for your master password when you are trying to log in to the page, not when you happen to visit page that password is stored. This makes feasible to use configuration where the password is forgotten either immediatelly or after few minutes. Having encrypted password store in FF or Chrome and not storing the password all the time in memory is essentially unusable.