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Devs who don't feel that way aren't talking about the stuff you're talking about. Look at it this way - a powerful debugger gives you superpowers. That doesn't mean it turns bad devs into good devs, or that devs with a powerful debugger never write bad code! If somebody says a powerful debugger gives them superpowers they're not claiming those things; they're claiming that it makes good devs even better.
The best debugger in the world would make me about 5% more efficient. That's about the percentage of my development time I spend going "WTF? Why is that happening?" That's the best possible improvement from the best possible debugger: about 5%. The reason is that I almost always have a complete understanding of everything that is happening in all code that I write. Not because I have a mega-brain; only because "under…
Also: I don't use debuggers much either. Is Superman's heat vision not a superpower because he rarely needs to melt things? :P