We stayed at Coronado last May and ate at Jiko one night, and Sanaa another night and also for lunch (we really like Sanaa!). We used taxis whenever we were coming from or going to Coronado. It was maybe 8min between the two, and extremely easy. I feel like it was maybe $12ish? Honestly, it's WELL worth the money to avoid the multiple buses to get you there. You might wait for just one of your buses longer than it would take you to ride the entire way in a taxi! We did the multiple bus thing from AKL to POR the prior year (changing buses in Downtown Disney) and it took forever - more than an hour. It was exhausting to do that with kids at the end of a long day. I plan everything to maximize our money/budget, and at a certain point I came to the realization that taking multiple buses to get from one resort to another wasted too much of our precious vacation time; when you think of it that way, it doesn't seem silly to spend a small amount on a taxi.
I believe uber tends to be cheaper than a taxi is, plus if you're new to uber you can get promotional credit to your account. But we hadn't tried uber ever at that point, and taxis are right there, with doormen to call them - so we went with that.