Is a standing desk worth it is an excellent question. If you are looking to introduce variation into your day you can be sure that your brain is benefiting.
The human brain is complex, dynamic and thrives on making new connections. This is a significant human advantage. New environments and conditions are Variations that feed the brain.
Variation (physical, cognitive, creative, emotional) brings new information to your brain and creates new neural pathways. We can't predict how new neural connections will impact your reality but we know that they will.
Whether the difference of standing rather than sitting brings your more comfort physically or helps you solve a problem you have been wrestling with we can't know. Why not give variation a chance to work its "magic". Sounds worth it to me!