Typically, yes, but not much. If I'm going to HI, it's all shorts and light t-shirts anyway. If I pack for 4 days of mix & match type stuff, 2 swimsuits, I can still fit all that, and my snorkel gear into a carry-on, but I prefer to use a slightly larger bag, and check it. The slightly more dressy clothes I'll wear on the plane are sufficient for any "nicer" restaurant I might go to. (Mama's Fish House!) In a week, I'll typically run 1 load. I run them before I leave as well.
If I'm going somewhere more clothing intensive, like Yellowstone, laundry facilities are a must. The extra stuff you have to pack just in case, sucks up space, and limits the day to day availability. For example, last time we were at Yellowstone, the 1st day we were in the park it was 28F and blowing snow. 3 days later it was 70F, and it swung back & forth a good bit.