I've been doing 1.5 gal boils for years...13+ (minus the 5 years I lived in Germany).
I put 4 gal s of water jugs in the freezer 4-5 hours prior to brewing to cool my wort in the primary.
About the hop utilization...the max bittering you can extract is 30% in 1 gal of water and 1 lb of malt. 30% at 60 to 90 mins...so why boil 90 mins when 60 does it. Additionally, you can boil for 30 mins and double your hops and get the same bittering.
I also only use 1 lb of malt for the entire 60 min boil. At 45 mins I remove the pot from the flame and add all the remaining malt for the recipe. I've also boiled 15 additional mins as well as just let it sit for 15 mins. Letting it sit pasteurizes as well as keeps the carmelization (and dark color from burning the sugar).
I have made beers almost as light in color as Buttwiper...although much tastier.
There are more ways to brew than there are brewers.