The engineers way of thinking about Fitt's Law is as a human control system. We motion control our hands by using feedback (visual, tactile, proprioceptive). The servo time response to a step function (new location to click) of that feedback loop depends on the required accuracy and allowed overshoot. The larger the target, the higher a velocity/acceleration you can use to hit it without missing. You learn very quickly that large objects (like edge of screen) allow much more gross movements than single pixel target... and the farther you have to go the larger the time at a given tracking velocity.

What is at least as interesting is the cognitive load of tracking/pointing, clicking/chording . Mental load and apparent time appear to be the reason why typing can be slower than a menu system, but it feels faster. Similarly, people will report a feeling like a trackpoint (IBM keyboard nipple) takes longer than a mouse even when they're actually faster in hitting targets. Presumably, this is because they have to track the cursor to know velocity and position, while a mouse or touchpad uses your body's knowledge of hand position/velocity that is missing from a force based input.

What you're used to feels right in any case.