Using sets instead of loops is a sensible thing to do. After using LINQ or a proper functional language it's hard to go back.

Using past tense instead of explicit state handling is actually a very interesting idea that I don't see being commonly used. Wort thinking about.

But... Event-based logic is often the source of horrendous complexity and bugs due to timing and exponential complexity of dealing with various sequence permuations. This is one of those things that I firmly believe people should be conditioned to avoid at all cost by using either functional (immutability+recursion) or logic (rules+deduction) flavors of programming. This is one of those things that's really not intuitive to get started with but provides huge benefits in the long run.