I have changed opinions on the power/weight issue a few times over the years. Right now I use two saws the most -- Stihl 461 (biggest, heaviest) and Echo CS-330 top handle (smallest, lightest) -- while my middle saws (Stihl MS-261, Echo CS-400) have been sitting clean on the shelf. The power of the 461 is intoxicating once you become accustomed to it, which offsets the weight issue quite a bit. There's no doubt I get done quicker with that saw, so I can do a day's work in less time.
I normally buck logs into 4 foot sections and then carry them to my wood area with the tractor, or skid them in as 8-12 footers and buck into 4 foot sections there. At that point, I stack as many 4 foot sections as will fit into my sawbuck, and do a mass-bucking operation with the 461 and a 20" or 28" bar to get my firewood rounds. Sometimes I can saw through as many as 4-5 logs in one cut. Not something I would try with a smaller saw.
I agree the power is intoxicating, but spend the day balls deep in snow and a couple of pounds makes a big difference, I never felled a tree a 60cc saw couldn't handle, and with very little lost to the 70+cc saws. We run a farm and most of our wood is cut in the winter so that makes a big difference, less heat, less friction, easier on chain and saw. When my wife asks how many saws (substitute tractor, gun, tools, beers) do you need, I just smile and say 1 more.
Not to criticize but cutting multiple logs at once is a dangerous practice, easy to get a kickback, and if she goes you ain't gonna hold that saw down. I've Done it, do it but that doesn't make it OK.
Here's what I think
15 years old, Gonna try grand dads little 50cc out, help cut a little wood.
20 years old, need a bigger saw 60cc, on top of the world
25 years old, bigger is better, 70cc anything worth doing Is worth doing fast
30 years old, in our prime, 85cc you can't stop me now
40 years old, 70cc just trying to get a load a day to pay the bills
50 years old, 60cc I would have taken better care of my self if I knew I was gonna live this long
60 years old, 50cc Let the young bucks do the heavy stuff, show the grand son how to cut a little.
70 years old, 40cc Gotta cut a branch or 2 every now and again, hate to get out of my heated cab, maybe I'll wait for the kid to cut it.