I've always thought the same way! On our first family trip to Europe in 2014, which was a
DCL Mediterranean cruise, I carried a 28 inch suitcase and a 21 inch carry on and each bag was filled to the gills. We are also a camping family so when you travel via RV, you don't have to worry about overpacking, you take what you want and as much as your RV can store (which could be my whole warerobe, lol).
I did really struggle with how to pack appropriately for this trip knowing I'd be carrying my own suitcase. I packed, unpacked and repacked five times the Sunday before we left and by the end of the day, thought I was good to go. Well then Mother Nature had her say....the forecast changed drastically (much warmer temps) so I had to rethink pants to capris and shorts, and less long sleeve shirts. So an hour before I left to go to the airport I unpacked and repacked for the final time.
And now that I've done it, I can't imagine going back to taking so much stuff with me on these trips. I packed mostly solid colored shirts and took a couple of sweaters and scarves to mix it up a bit. When you're changing hotels every 2-3 nights for two weeks, you get tired easily of unpacking and repacking. I'll take a lesson from some of my tourmates and better utilize packing cubes next time to sort things by day, that way I'm only unpacking a cube versus everything!