Not me. I’m using an iPhone SE3, installed 18.5 early this week; it ran a tiny bit warm & slow, ran the battery down quicker than usual in the first 24 hours as various apps did their thing updating to it in the background.
Then back to normal even when I was doing heavy searches and map reroutes on a road trip. Spotty cell service in heavy weather was the only issue.
I understand it really depends on what model, what apps you have and how you have them set to refresh. I keep all but the “most core or important for me” apps set to only update on WiFi &/or when accessed” so they don’t all leap in at once every update.
Edit to add: I don’t think I’ve looked at ‘Garage Band’ in 2 years 😝 so it’s probably still sitting back on iOS 17 or so?!! IDK who uses it; keep thinking I should just free space and uninstall it.