Fun fact (from "Behind the Voice Actors"): the Geico Gecko is named Martin, and has been voiced by Richard Steven Horvitz, Kelsey Grammer, Thomas Bromhead, Dave Kelly, Andrew Randall, and now Jake Wood of "Eastenders".
I feel like practice has helped — especially experimenting with various placements of seeds, and not hanging on to an idea that just isn’t going to fill smoothly. (And of course autofillers are super-speedy at this grid size.) Also, since black square placement is one of the things I struggle with, this just makes that completely moot!