Blue H - Just as has been said before, you use the method that fits the leg you have to fly, in AUS with only limited features you NEED to use time markers associated with those features that are available, in the UK/Europe with more features then 6 min marks or proportional marks become more relavent.
Cat driver - I would hope that by the time a pilot is going for his first job he is a LOT faster at planning and more aware of WIHIH than an ab -inito student.