What does he mean by "Now I've seen everything"?
The momentum for change is breathtaking. Dennis just cornered me after a meeting to say he personally wants to participate in several new initiatives to find cross-functional efficiencies. Now I've seen everything!
What does he mean by "Now I've seen everything"?

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That's an expression of amazement. The implication is that after you've seen this thing, there is nothing that could surprise you.

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I think is: Ahora lo veo todo! You use it when you haven't got things very clearly about a tropic and  they explain you that thing specifically, and then you understand everything is like NOW I'VE SEEN EVERYTHING or that's how I would interpretate in Spanish....