[robbles]

It does seem that way when you're a skilled typist, but I recall reading an article about a year ago where they discovered that forcing the average user to re-enter their email significantly improved their rate of invalid emails (e.g. not detectable by a regex, like [e-mail] or [e-mail]).

A feature like this should probably be considered based on the expected type of user vs. the convenience of signing up quickly. Non-technical users where there isn't a significant dropoff from the signup form => probably a good idea.