Since getting the IMCr/IR(R) I've made some sort of effort to plan each flight as IFR, even when I expect CAVOK, on the grounds that there's no point in having the rating if I'm not prepared to use it should I have to or want to. So I've always got a full list of frequencies, VOR radials, DME distances etc in front of me ... which on some flights I never look at.
This story encourages me to continue doing so, and to take the planning seriously!
The alternative for me, as piperboy suggests, is to decide "this is a VFR bimble" and refrain from taking off if the weather could be a bit iffy.