You can definitely notice the difference between a formerly top of the line Intel MacBook Pro and an M1 Air. The Air is way faster for opening apps, photo library, and other common daily activities.
I work on a 25-year-old research hydrology model written in C. My M1 Mac mini runs the model about 68% faster than my 2019 i9 MacBook Pro. Definitely thinking of trading that in once a 64GB M1-based system is available.