Out of our 3 previous cruises plus the upcomming 4th cruise to Japan we only chose Cherry Blossom time once. And yes, it was absolutely fantastic and unforgettable!
However, it also has it´s downsides and challenges:
- Cost - the Cherry Blossom cruises are even more expensive
- Time - You might hit the right time for Hanami... you might not.
- Weather - weather in spring can be unstable and wet. For example, we had a nice but pretty wet day in Aomori, where the blossoms were the nicest. Friends are currently in Japan on Princess and the pics look pretty grey.
Don´t get me wrong. I am not saying you shouldn´t go during the time. It´s nice - and if you are lucky it´s probably almost pleasantly overwhelming and unforgettable. BUT other seasons in Japan are also fabulous. The fall colors are very pretty as well.
So I guess in a nutshell I´d answer your question with: Yes, other times would also be good!