I agree with what deanna is saying because I think that so much of GD really IS the mindset you have going into it.
Some mamas here have described children who do well when given some alone time when things get "out of hand". There are many ways to do this, but I think the attitude of the parent will go a long way towards making the situation one of helpfulness and guidance (i.e. parent and child working together) as opposed to a punitive situation (i.e. parent forces child, child has no input to the situation).
To the mama with the spirited child: I think it's wrong to suggest that if a child doesn't need time out then he isn't spirited enough. I don't think of punitive responses as something that rests on the "extreme" of an "effective GD tools" spectrum, something that needs to be brought out only when the situation becomes hard enough, or the child is "spirited enough". Instead, I consider punishment to the be last resort of a parent who is plain and simple out of ideas. But the limits of our own ignorance does not represent some absolute Truth that non-coercive parenting "doesn't work for all children". When we don't know what else to do, we fall back on what is comfortable. For many of us, that means getting punitive (especially if you were raised that way yourself).
I often find myself in a situation where my usual bag of GD tricks isn't working. Redirection, talking, etc - none of these are having the desired effect. And I do get tempted sometimes to "get harsher" and be punitive. But I have "disallowed" myself that option. So instead, I have to look harder for a solution. I come to this forum and ask for advice, or read some threads where parents are dealing with similar situations. I may go back and read some of my GD books for inspiration, or get some new book from the library. If you rule out punishment completely, you aren't left "empty handed". On the contrary, it forces you to go out and LEARN MORE to find the answers you are looking for. My philosophy is that there is ALWAYS a gentle and supportive way to help the child; it's just that sometimes I don't know what that is!

There are kids who need their own space to calm down. To me, the difference is whether the parent is IMPOSING that on the child by using their power as a bigger, psychologically more powerful, human being or is the parent acting as an "emotion coach" to the child, helping the child to find that quiet space, asking the child how they would like to spend that time (within limits, perhaps) such as reading a book or drawing. Maybe the child needs to be held, or maybe the child needs to be left to tantrum and get it out of their system with the parent making themselves available to the child when/if the child asks for them. Timeout can just be so many things.
Like deanna said, it is hairsplitting, but I agree that the attitude going into it can make all the difference.