I believe you can walk through all the queues without riding and just take the “chicken exit” at the end.
Which ones are worth walking through is highly subjective, based on what your interests are. I am a huge Harry Potter fan, so I would definitely walk through Escape from Gringotts and Forbidden Journey. I am not a huge fan of Spiderman, but that line can be interesting as well. If you like the Fast and Furious franchise, the line is great, filled with lots of Easter eggs and other fun references. The ride is terrible, even if you like the franchise. The Jimmy Fallon ride has a lot of fun pre-show experiences that are neat to watch, even if you choose not to ride.
Lastly, as @darkmite2 mentioned, MIB has an immigration tour, the Mummy has a production tour and I believe the Hulk has a tour of some sort. These are tours that are available if there is a TM available to do the tour. They take you behind the scenes and you learn some pretty cool background stuff about the ride. At the end, they take you right to the front of the line to ride the ride if you so choose. They are not always available, but I have always asked at the entrance to the ride to see if we could get a tour.