Savage Wombat
Hero
Yes, yes I have. But my players tended to have more well rounded characters. I've seen fighters switch between S&B, TWF, and missile combat, depending on the situation. It might be something as simple as the fighter was fighting sword and board, was disarmed of his shield, pulled a dagger in his left hand, and "switched modes". Or that we had a fight that began at a distance, so everyone was ducking behind cover, using missile weapons etc. then, when the enemy was whittled down a little, the fighter drops his bow, draws his sword and charges in to finish the fight.
In my experience (and that's over 30 years at this point) the D&D system has changed over time to encourage specialization in a single style of combat. Now that, using 3.5/Pathfinder as an example, the game is built to expect that a fighter has weapon focus, weapon specialization, and feats chosen to support that weapon, a fighter who tries to use multiple styles is actually at a slight disadvantage in play. This is not a matter of good play/bad play, just a change in what the game designers assume is normal.
I actually have caught players out who forgot that they might need a missile weapon once in a while - they aren't "good" with a bow like a bow specialist would be, so they don't see the point in using or carrying one.