I really like the fenix flashlight I have. Main button on back turns light on and remembers your last setting (except strobe). There is one other button along the side. Pressing once cycles up the brightness until max, holding turns on the strobe. Very easy to use. I often use it on the lowest brightness and just turn it up if needed. The side button also doubles as the charging indicator, glowing red while charging and green when fully charged.

As for strobing lights i use them to signal or mark things at night. Some peope use them while cycling or walking at night to increase how visible they are. I sometimes use a strobe to mark tents or ice huts in the dark but i usually try to use strobing red light as its less distracting and uses less power