It actually costs effort for me, it interrupts my reading flow when I see an obvious spelling or grammatical error.

The theory that the read/read confusion is a major problem is based on an overly simplistic model of the way people read as well. Experiments have shown that people are capable of interpreting words based on contextual cues from later in the sentence - the brain is receiving visual information from words that come positionally later and uses it to resolve ambiguities while parsing text.

Sorry, didn't realize I was unique in this regard. Obviously, I can infer the meaning from context too, but sometimes -- like at the beginning of the sentence, it takes a second to adjust. And sometimes context can't even disambiguate.

In contrast, if you see "red", you immediately think of the sound of the word "red", which jumps you straight into thinking of past tense. (Again, for me at least.) That's why every other verb like this works the same way (lead-led, breed-bred, etc.).