Not alone!
I'm glad to see this thread generating so many responses. Sometimes I think I'm the only one with a fetish for writing instruments. As a kid I used to love it when school would start, because it would mean shopping for fresh new school supplies.
Nowadays at work I have pencils and pens available everywhere, so I can usually just grab one within arm's reach. Yeah, the pencils get stubby after awhile, but somehow rarely ever actually get thrown away. They just migrate from one location and use to another. Kind of like blades going from matcutting to paper trimming to frame scraping, etc. as they age/dull.
As to the pencils breaking in the sharpener, it's the same problem we have these days with mouldings: "snotwood". Used to be you could rely on the old Dixon Ticonderogas (#2-1/2 was my favorite), but even those have slipped in quality. The wood just can't hold up to the rigors of sharpening. I've actually had good luck with generic #2 pencils in packs of 10 or so from Meijer's. They come in nice colors too, some with color-coordinated erasers. They write very smoothly, but get dull fairly quickly. However, they do sharpen easily to a nice pointy finish. For mat marking, I usually use a mechanical pencil with .5 leads.
What about mat-marking aids? Must-haves for me are a tool called a Matline (which may be discontinued now), and a plastic guage for locating inklines on mats that I think came from Light Impressions. Also, I can't be without flexible plastic rulers made by C-Thru, preferrably in white. (The clear ones make it harder to see the markings.)
As for pens, I use all kinds, but my favorite for writing is a good old Parker Jotter ballpoint. Writes smoothly and lasts for ages. I've always carried a pen clipped in my back pocket next to my wallet, and found that even the chrome Jotter had a clip that was just too weak. So, years ago I converted a nice fat metal Rotring rollerball pen with an industrial strength clip (that goes all the way to the top of the cap) to take a Parker cartridge, resulting in my ideal pen.
I also collect all kinds of interesting pens, either beautiful or unusual (but not expensive). My wife got me a showcase box for them, which I customized by replacing its top with a Bella veneer moulding.
Write on!

Rick