I didn't want one, didn't reckon I needed one, but came home one day to find the ex had taken out a cupboard and moved the washing machine into its place so he could fit his mother's 22 year old Ariston dishwasher in the space.
In the years since then, at different points and in different houses, I've gone without/made do without
Freezer - 9 years
Microwave - 5 years
Carpet in my bedroom - 12 years
Fridge - 4 weeks
Washing machine - 6 weeks
Built in oven - 4 years and counting
Vacuum cleaner - 2 weeks
Kettle - 10 days
Guess how long I went without a dishwasher in that time? 3 days. I was ordering the first replacement the following afternoon and then when the second one gave up the ghost after 15 years, I was ordering it by the time the kettle had boiled.
Once you get one, you will not want to go back to all of the washing up every day, at least 3 times for meals, pots, pans, plates, cups, spoons, glasses and everything else that can go in one.