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I do have to agree with 411 as far as the level of proficiency
needed on Morse code. I however cannot agree with his manner. Not all on this side are like him.
I am in complete agreement with you, it is easy to twist in the wrong freq on a navaid, I have done it as have most pilots. I back it up by listening and matching what I hear with what is on the chart.
As I live near the border with Mexico, my Spanish is pretty good. It is however a second language, and I make errors. Morse code is a second language for pilots. In the heat of battle, you might hear what you want to hear, rather than whats being transmitted. This is why I match it as its playing to see whats on the chart.
Despite having memorized all things LAX, I still pull out the arrival/DP/appch chart, etc. I am in and out of there 2 to 3 times a day, but I still verify what I am doing against them as opposed to memory.