The reason most professional kitchens use gas cooktops is that they can easily control the heat. With a simple turn of the dial, the flame gets bigger or smaller so the change in heat is immediate and precise. This saves time and ensures dishes aren't spoilt by a slow response.
While the convenience of instant heat means gas appliances are much faster to heat up than older electric versions, there's also the bonus of seeing the flame. This helps you assess heat levels and obtain temperatures closer to those recommended in recipe books, meaning more consistent, dependable results every time you cook.
There's a reason for the saying, "we're cooking with gas!"