Not that I have a pony in t his race. . .
But. Since the title of the thread is "What do you like/love when vacuuming."
To state that you love the sound of dirt and grit going up the tube is totally appropriate.
Now if it had been "what do you like about repairing/restoring a vacuum" then the dirt grit part may not be on topic. and vise/vers.
Just my opinion.
For the record, again off topic, I also like to mow the lawn, till the garden, trim with an edger. All not because I enjoy manual labor, but because I enjoy the accomplishment of getting the task done, and well using power tools.
Vacuuming is the same. I see progress, I feel accomplishment, and as I have stated before for me it is relaxing as I can get lost in the sound of the vacuum and be in my own world.