Are you using boot foot waders, JohnR?
All of my waders are stocking foot waders and I put on seperate wading boots. I've never jammed a toe or felt like my feet were sliding around EVER. Yeah, they take a longer to put on, but they are more comfortable and give you way better ankle support and protection. I've walked pretty far in mine when I am fishing down in southern RI: my fitness is the issue & not my gear, LOL.
I've seen some lace up boot foot waders, but have never tried them.