I use flight modes all the time on my jets, usually Take Off, Cruise and Landing modes. This enables me to ensure that for example the flaps are pre set to take off position just by setting one switch, and that my gear will be down, brakes enabled, and handbrake on as the default setting. Also any slight trim changes that are necessary can be taken care of. It is not only about lowering pilot workload although it certainly does that, its about repeatability. Knowing that each time I flick that switch, exactly the same set of things will occur as last time is not only reassuring but it allows me to really get in the groove with a model. Does that make sense?