I disagree if you mean "usage" to be "direct usage".

My guess would be that most "equations" in biology curriculum are not really related to biological or physical processes directly, but rather to statistics, experimental setup, i.e. data interpretation and manipulation.

Now, of course, stats are very important and are probably basic knowledge is key in reading and critically analyzing any scientific paper. So I am not criticizing that. However my opinion is that mathematics is not as critical to biology as it is critical for physics.