I think it's worth the effort. I also boil on a stove for the time being and I usually do 5 gal batches. My last beer I pretty much did a split.
I put 1 gal in my main kettle, to steep my grains in, then boiled another gal on the side in a separate kettle. Once the second kettle reached the temp I wanted I added it to the main kettle. I then added another 2.5 gals (room temp water) and brought it up to my temp; which took about 10-15 minutes. I then added about 3/4 gal, during the ice bath, to bring the overall volume to 5 gals (forgot to account for boil off). I then put it all in my fermenter. Kind of a funky process but it worked for me and it was pretty much a full volume boil by the end of it.
Doing full volume boils is the way to go. Late extract additions also help your beer too. It will help head retention, hop utilization and clarity.
Now I want a beer!