I'm a sweater....
Even in temps down to 10-15, I will start hiking with a long sleeve base layer only, maybe a light shell over it of it's windy. It'll be cold for a bit. Any more than this and I'll get really sweaty and hot on the hike in to glass/hunt, etc. Most of my hike-ins are pretty physical though.
Upon reaching my destination, I'll either switch out my usually soaked base layer with a dry one, add a lofted puffy, and an outer jacket. If it's really cold while glassing, I'll throw on two mid layers.....
Pretty much sums me up as well.
