Some great suggestions here.
I alway's use the edge of my square ruler at a 45* angle to scrape away the lint and such from the cutting line. I also take the blade edge at a 45* angle and pull the snipits and such away from the ruler edge after I cut a piece of fabric. Just a habit and I don't get buildup too often. Usually buildup is from heavier fabrics like Fleece and denim for me. I also vary which cutting lines I use. That is: if the pattern calls for 10" of fabric I move the fabric edge to the 10" mark and cut on the 20" mark
I learned NOT to press on the board the hard way.
Alway's be sure your blade is sharp, if you really have to put some elbow grease into cutting, you either have arthritis or you have a dull blade.Change blades.
I actually use the green Olfa mats (I have three sizes) because the color is easier on my eyes, the cutting lines show up better for me, like the thickness of the board. I believe Quilt In A Day has them on sale right now at 45% off (or did earlier this week).