One thing that I noticed wearing ear protection was that after a full day of riding with ear protection I wasn't as tired at the end of the day.
I took a bit of convincing that this function was legit; you could easily ride longer (not necessarily farther...) and fatigue is reduced to some degree. Some of that relates to the level of volume your ears are subject to when you dial up the knob when you're cruising at 65 or 75 MPH for a couple hours at a stretch. Fatigue is coming from all sound sources, not just wind noise.But one thing I did notice and it was pointed out in the article and mentioned in a couple other posts, I didnt feel as beat up on road trips at the end of the day. I never realized how wind noise would affect you like that until after actually trying it. I have to start remembering to use them more often now...
It's more challenging when you want to try it, and your passenger doesn't feel the hassle is worth the bother to plug in.