There's simply nothing better than reaching the next refugio, and getting settled. It's a daily sense of accomplishment. The next best thing is to take off the boots you've been wearing all day and let your feet breath.
There are some pilgrims who only travel with a pair of hiking boots. Others (like me) choose to carry a second pair of shoes. It was great letting my feet breath and dry after showers. Having something lighter also made the evenings more enjoyable. But, as with the entire packing list, the choice of what to take is yours. A second foot covering will add some weight.
Now, you might choose to take along a simple pair of shower shoes or even flip/flops. It's worth noting that all the places I stayed along the Via de La Plata were very clean and I never felt like I needed to not be barefoot in the shower, but to each their own. Shower shoes or flip/flops are incredibly light weight, so they don't add much to your pack. And, they're are many styles to choose from. Plus, if you blow out a flip/flop, they're very easy to replace along the way.
The second choice is to take a pair of sandals. These can double as shower shoes, but have the added advantage that they offer more support to your feet when you're out exploring the villages or towns, having meals, et. al.
I went a bit heavier, and chose a pair of Keens as my second shoes. I like that they offered covered toes. There were several times I would have stubbed my toes on the uneven stone streets and sidewalks in the ancient villages and towns (I can be a bit clumsy.)
It addition, the Keens were a great asset when I had to ford several wide streams and irrigation moments. When that happened the choice was wet boots, risking going shoe-less (something I wasn't willing to do), or swapping out my sandals--a super option.
As with all the packing options, try things on when possible, break things in before you go, and choose items that will help you feel comfortable and safe.