I'm fairly new to reloading. I enjoy keeping data (I'm weird in that way), so that's really why I bought a chronograph. I would venture to say that it may be even more important for someone new to reloading to have a chronograph. No, you don't really need one. But the feedback it gives you teaches you about how much variation you're getting in your loads.
I also found it interesting that after shooting a few rounds and noticing the correlation with recoil and velocity readings, I can guess pretty closely what the fps is going to read before it actually appears on the screen, just based on the recoil I feel.
Chronograph is not necessary. But it is a very useful tool.