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> underscored_names may be easier to read but camelCasedNames are easier to write

Code gets read more than once. If it makes code easier to read, I'll do it, even if it takes me a tiny bit longer to write that extra character.

Agreed. As has been said many times, code is much easier to write than it is to read (or debug), so make that sacrifice now.

I find it harder to type camel-cased names, because I seem to end up mis-timing my shift and ending up with camelcAsed or camelCAsed or even cameLCased names

i tend to use camelCasing in most of my code (php|js). Both class names, methods and properties. I prefix private and protected with _ though

Matz chose underscore_casing in Ruby because non-english speakers have an easier time reading underscore_cased words.

One can also make the argument that code is read more often than written.