Comment by fenomas

I mean, do you want to know or are you venting? If the former: No, spoken Japanese is not constantly confusing, because (a) some words are distinguished by intonation, (b) Japanese speakers know what the homophones are, and either avoid them while speaking, establish the context before saying them, say extra words to clarify which word they mean, etc.

edit: Kind of humorously, in some cases groups also develop lingo to avoid homophones. E.g. the JP words for science and chemistry both have the standard pronunciation "kagaku", so people in industries where both terms are used often use nonstandard pronunciations (bakegaku for chemistry).

Also the homophones thing is probably lesser of the things I mentioned. A typical sentence might only have 1 or 2 overloaded words, but it will have lots of substrings that can be parsed multiple ways.