That's not exactly true, regarding pattern planes. Although they are "slippery", they are not necessarily fast, although, like anything else, they can be fast.

Pattern is flown with "maximum" control. Each flight that I do gets trimmed up for straight and level flight at about half throttle. Then the maneuvers go from there. Going vertical, for instance, requires pushing the throttle to full followed by a pull to vertical, followed by whatever throttle management setting is required for the maneuver. A stall turn, or hammerhead, the pilot will pull to vertical, then at the right moment, reduces throttle to min and pushes over for the proper maneuver.

On the way down, straight down, the throttle is usually kept at minimum until the return to straight and level where the throttle is moved back to about half.

The throttle is not an on-off switch. If it is used as such, even pattern planes will fly fast as will a trainer.

CGr.