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Re:Things I Learned from a Job Hunt for a Senior Engineering... by nugator on Tuesday April 24, 2018 @04:36PM (#16916316)
I came across it when studying computer science 20 years ago, yes. Heard about it after that but never directly needed the knowledge.

I'm sure it's used under the hood in a lot of code I write and have written but so is XOR, manual memory management and a bunch of other lower level implementations that I don't need to spend time on when developing on a higher abstraction level.

Not sure why you would expect all programmers to know about binary trees specifically.

Re:Things I Learned from a Job Hunt for a Senior Engineering... by Retra on Wednesday April 25, 2018 @12:05AM (#16918559)
Binary trees are the simplest kind of nontrivial tree, and trees are used extensively in programming. Most computer problems are solved using trees of one kind or another.