Yeah a smooth clean driveway can be pretty straight forward, guess im unlucky as mine are rarely like that. The time i invest in sealing on the rare occasions i do it, i can't help feel would be better spent on several straight forward paving cleans.
Also with the unpredictable weather, or throw in the odd rough surface and work can build up, especially when applying 2 or in some bad cases 3 coats.
Personally I tend to avoid paving sealing or tarmac sealing as I find it a bit of a hassle and not very enjoyable, and to be honest i find it hard to get motivated at the best of times, hence, i try to avoid nightmare(in my opinion) jobs.