What I did was practice getting my steeping grains to mashing temperatures.
Once I was pretty confident about hitting 93F and 122F and so on I just went to a bigger pot.
Stove top I can handle ~5-6 pounds of grain, and using less extract gives me a beer that tastes better to me. Very few electric stoves can handle a boil over about three gallons or so.
It is inevitable that I will go all grain. But I live in Alaska, so nine months out of the year I pretty well have to brew indoors on my stovetop, even if I have AG equipment in the garage.