[sausagefeet]

I think LaTeX does this. Anything more than 1 whitespace is ignored.

[splat]

Yes, LaTeX ignores anything more than one whitespace in the source. It does, however, automatically insert extra space after a period. (Unless you disable it with the ~ symbol, e.g. after the word Mr. or e.g.)

[koenigdavidmj]

It is not two full spaces, however, but a wider single space. Closer to 1.5 normal spaces.