I owned a 2019 16" MacBook Pro from launch day until October 2021. Compared to that, in my use, the Apple Silicon has been everything Apple said it would be. My 2019 16" would get hot to the point of being uncomfortable with almost any usage beyond simple web browsing (and even then it would get quite warm). I push my computers pretty hard (developing mobile games, editing 4K video, 3D rendering at high resolutions, architectural design). With those types of task being done on a regular basis, my 2019 16" spent the majority of its life plugged in. The laptop would only last for max 2 hours whenever a "Pro" level task was being done.
Then comes the M1 Max...
This laptop has been my best Apple purchase in years! I can do 3D modeling in Blender for 4-5 hours straight without the computer heating up (unless I'm rendering) and still have some juice left to surf the web for a bit. When it comes to video editing, my old 2019 16" could only go max 2-3 hours before it had to be plugged in (and by then the laptop would be hot enough to cook off of). With my 16" M1 Max, I have on multiple occasions edited a 15-20 minute 4K video with several effects layers, rendered the video, uploaded the video to Youtube and STILL had some power left...
The only area I wish Apple stepped things up is the graphics. Might have to wait for M3 for GPU rendering.