I disagree, as long as we're talking in ratios instead of absolute amounts. The difference between "a pinch of baking powder" vs "5 grams of baking powder" is about a factor of 20. I think the main differences between baking and other cooking are that: 1) There are often very large ratios of certain ingredients in baking which -- except for spices -- is not generally the case in other cooking; 2) You can often taste the food in an intermediate stage when cooking, and adjust the ratios -- e.g. for spices -- which is not generally as useful when baking.

Of course using a scale is a good way to keep the ratios from getting too out of wack, and I usually do it too when baking and almost never when cooking.