I don't know if this has been suggested yet, but something I think would be really nice is to bind player tokens to the player tab.
That way all you have to do is move your tab over to the new map and all your player's tokens are there.
Now I know the problem would be the player tokens being in different places due to different map sizes.
I think if you put them all in the top left corner dragging them where they need to be will be more efficient that copy and pasting! Thank's for reading!