1. No, I don't disregard analogies, I'm just able to recognize and isolate analogies from a topic or a point. For learning, I agree an analogy is very useful.
Analogies are tools for illustration, not for proving a point. To use a tool to illustrate a concept that is already well known (learning for example) is often pointless.
In terms of utility, much of the utility of analogies is similar to the utility of art, music or humor. You can enjoy humor, but humor itself doesn't offer any greater insight or a topic.
2. Analogies are useful for illustrating things that cannot be imagined by the human mind. The extrusion of a 3 dimensional cube into a 4 dimensional cube cannot be pictured by your minds eye. You can only visualize the analogy: The extrusion of a 2 dimensional square plane to a 3 dimensional cube. The entire field and existence of higher dimensional geometry is inferred from analogies.
Note that these are only good for things that are not known by you. Much of literature and speeches use analogies for things that are well known. For a list of examples where analogies are mostly useless see here:
https://www.goodreads.com/quotes/tag/analogy