Oh, such a good topic!
Putting on too much cologne is one of my pet fears - like many here, I like scent to be very subtle. I've said it before, but my philosophy is that while everyone should smell good, other people really shouldn't be aware of a particular fragrance unless they're close enough to hug me. As a result, I never
get a comment on fragrance day to day - just from certain, more intimate companions
My usual application - one spritz to the chest, one to the back of my neck. If a scent is particularly fleeting, I may do two shots to the chest - one on either side. Any more is usually too much for me.
That said, there have been two times when I thought I went overboard - Guerlian Vetiver and YSL M7. I did my normal application - but went around all day in a haze of fragrance - it was like I couldn't really even see
through it. I had to eventually ditch both these fragrances - almost full bottles too! the waste! I just couldn't wear them.
I was in a store recently and tried (and eventually got) M7 Fresh. The SA offered me a squirt, but then proceeded to blast my entire arm. I thought I was a goner, but M7 Fresh doesn't seem to have the same awesome power of the original.