Here in Wisconsin, I have been working my way, segment by segment, thru the Ice Age National Scenic Trail. Everyone says hi when you meet.
In the more remote areas, most not only say hi but stop and chat for awhile about trail conditions, mileage etc. Most days on the remote sections you don't see anyone so it is nice to take a little break.
Heading to Olympic NP next month. I'll make sure not to say hi to fellow hikers!