As I coincidentally just commented in the "square pad" thread, Nigel, you bet I do. After working for Tektronix for several years, I adopted their standards of board layout. All resistors lay with their tolerance bands pointing to the same edge of the board. It's subtle, but the board looks nicer when completed and it's also easier to read the values at a glance. Of course, most companies used automatic insertion equipment and that's why their resistors always landed the same direction.
With caps and diodes, I try to keep things the same direction but am willing to wander a bit there. For instance, a bridge rectifier is never laid out in a "diamond" textbook pattern, but always as four diodes laying parallel to each other, either in a line or in a rectangle shape.
I also install and label test points at critical areas to aid in troubleshooting and calibration. Tek did that because a scope or meter probe hooked to a component lead every six months for a calibration will eventually do damage. I also make sure that I have a good, solid ground test point available.
Dean