This is how I used to do it as well, before I lucked into a keg and made a keggle. Larger kettle, but same process.
Quick Q: is there any reason you don't do a sparge? My preboil volume is 7 gallons with either a single or double batch sparge, and I could fit that in my 7 gallon kettle. I either run the first runnings off into a bucket, or heat my sparge water in a separate kettle (which I now have thanks to my keggle).
Just wondering, always looking to simplify process.
Exactly that, simplify and shorten the process.
By doing a full volume, no sparge mash, I only have to heat water once and drain once. I actually have 2 kettles, my 8gal pot and a 15gal keggle. I'll use the keggle for larger batches or higher gravity 5gal brews, but since most of my beers are OG1.040-1.050 and 5gal, my 8gal pot works just fine, although occasionally I need to add a little top up water to my boil (depending on gravity readings during the boil).