True, not having kids does save me a lot! However I only have one income into my house. A lot of families have 2 incomes (not sure about your situation )
I'm different to you in that if I doubled my salary, I wouldn't change my lifestyle. Maybe a slightly bigger property. Nothing else would change. I'm not materialistic in that sense. To me, money is about giving me the freedom to retire as early as possible. If I can go at 50 or earlier, great. I don't want to be working at 65. Whether that happens I don't know, but it is the plan!
I don't go without, i'm not some miser!