Jeesus Bert! Now you with the witty headers!!Actually that's a great way to get from E to A, specially in a boogie-rock sort of way. Now if you just slide that barre up to the 4th fret, and bring your index down to the two bass strings at the second (or use your thumb like I do) you've got a real "Quick change" for blues.
Gotta make Duckboots' dinner or I'd be here longer. You've found my weak spot obviously.
Rick