VFR flight plans: are they worth filing ?

I recently posted this very question on the PPRuNe pliots' forum. Here's the thread. Bottom line seems to be that VFR Flight Plans are not considered very useful in the UK, but may be better elsewhere. Then again, given the ease with which they can be filed nowadays (e.g., http://www.eurofpl.eu/ ), probably worth doing. You never know, might be a useful 'get out of jail'...