My experience with mapping is very mania orientated. And let me tell you, a lot of us mania mappers use many tools outside of the osu editor to help us achieve the great results. Advanced granular stretching (abraker's post) and slowing the music down like I described using other programs, as well as a waveform and spectral visual aid are among a few of these tools.
You're right, it's much less important for ctb and standard to follow the music's rhythm very accurately, but that's no reason to make Taiko and Mania mappers suffer.
You're right, it's much less important for ctb and standard to follow the music's rhythm very accurately, but that's no reason to make Taiko and Mania mappers suffer.