I remember having some old school "by the book" professor - bow-tie and all - freshman year. He said something along the lines of "Smart people talk about ideas, intelligent people explain their ideas in such a way that anyone can understand them."
I always kept that in mind when writing, whether it was a one pager or a 35 page paper. I must admit, it did sometimes make meeting page requirements difficult at first, but I found out that if your paper has 10 pages of substance in an 8 page paper, professors didn't mind (except one strict formatting freak I had, but at least he knew his standards so he kept page limits lower).