I may sound like a screen real estate freak, but I think it's very important for a developer that everything s/he needs to accomplish his/her tasks should be there on a single screen. So I think the Toad team should be very careful when they make big changes that affects the UI. In 188.8.131.523 the padding of grid cells became bigger. Please compare the attached snapshots and see how many pixels are wasted in the new grid to see the first 6 rows.
I have just noticed that this is only the case when the skin is set to default. The grid looks more compact on other themes. But I think the grid size shouldn't be affected by the theme. After all, grid style and skin are two different options in Toad.