The single nicest thing about water resistance on my S7 is that I no longer have to worry about my phone if it rains heavily (which it often does in Britain). Even if my winter coat gets soaked to the inside (which can happen because Britain) I know my phone is safe. It's also nice when I have to make a call/send a message when it's raining. And I can still use my phone as normal even if it's drizzling.
Overall it's a really nice feature to have. People underestimate the usefulness of rain resistance. For the UK where it rains day and night, it is a huge benefit.
Overall it's a really nice feature to have. People underestimate the usefulness of rain resistance. For the UK where it rains day and night, it is a huge benefit.