Re: Bigger strings leading to a bigger/more aggressive sound?
Yep; they're louder due to their larger size warping the magnetic field more strongly. And they also rattle less and require a different attack. They're great for some things and not so great for others. My only electric guitar for many years wore a 15 - 58 set for at least 10 of those years. Sounded great, played great, never went out of tune, and the strings lasted for years at a time. When I downsized to 12's last year, I just needed to adjust the truss rod a bit and it was fine. (This is a raw maple neck too.) Each string set has its differences, and its uses. I don't much like anything lighter than 11's myself. They feel weird to me – completely unsuitable for how I tend to play. They go out of tune, they break, they buzz, they won't intonate right, they don't last very long, etc. People who learned and played for years on extra light strings like 9's and 10's probably feel similarly awkward on heavier strings.