You need a third option...sometimes.
At the value resorts, we did use them enough for cofee because we had little choice.
At the mods, it just wasn't worth the hassle. We tend to use them for coffee at breakfast. That means either of walking around with a mug all day or going all the way to the room to drop them off/pick them up. Neither is worth the hassle. I understand some mods have now added drink stations in their pools, so this may no longer be relevant, but we found other thean the first day, the only time we used them was for the pool. Even then, the drink station was far from the pool.
At deluxes, the distances may be a bit shorter, so it may be worth using them at the pool.
For us, I think I'm done with them. I have no problem with sharing drinks...but after three days of just being handwashed...yuck! Once we are home, we do use them as travel mugs, but I strongly prefer ceramic mugs when I'm able.