A lot of people like to unwind in the bath after a long day on their feet (usually women, moaning about their shoes giving them problems) with some bubble bath, candles perhaps
Or you could be like me and just want to wash and freshen up quickly regardless of how tired I am. Also with a bath you're lying in water which has your sweat, dirt in it etc... you're lying in the stuff you've washed off
Baths are good every once in a while in my eyes, what about you?
i feel like after I take a bath I am still dirty like you said, I feel more refreshed after a shower..plus I can adjust the temperature throughout the shower while with a bath your stuck with the choice you made at the beginning. I think a 10-15 minute shower is enough to relax me. I can't take long showers, its like chinese water torture after a while