They are not any faster. I don't use a progressive, so the scale has plenty of time to get the charge ready for me by the time I need it for the next round.
There is also no problem with "drift", as long as you turn it on and let it warm up before you start using it. I turn mine on first thing, then get the rest of my reloading stuff ready to go.
You will end up waiting on the scale if you use a progressive press. I guess that is another one of the differences between "mass produced" and "hand-made". It shouldn't really be a factor unless you are planning on reloading several boxes of shells at a time.
I used to use the cheap powder thrower that came with my kit. I ended up weighing, then having to top-off or lighten each load to make them all even. Don't know if it mattered all that much, but I just like the idea of knowing the EVERY charge is going to be EXACTLY the same. That way, I know range performance has more to do with my shooting abilities (or lack there-of) and less to do with the ammo I loaded.