Not for all of the other widely-used languages that still have incredibly simple interpreters. Think how much energy could have been saved if Ruby, Python, and PHP were all as fast as your average JS engine.
I would think we'd see even better improvements if developers would move towards statically typed languages as well.
In fact, looking at the market as it stands right now I'd say that performance concerns are almost entirely uncorrelated with programming environment adoption.
JS perf is important to users though. Faster execution means fewer watts spent rendering and interacting with your favorite web page.
(Fun fact: B3's backend contains a machine description language that gets compiled to C++ code by a ruby script, opcode_generator.rb. We use Ruby a lot.)
EDIT: I wonder why the positive effect to re-discovering that not all compilers need to be like C and C++ compile speeds and that it was once upon a time mainstream, is worthy of downvotes.
