Moderate wide angles are extremely useful for grab shots--especially fast 35mm. lenses in the 35mm. format. As your angle of view gets wider, it becomes more difficult to take pictures of people, but the lenses become more helpful for specialized purposes such as architectural photography. I find it takes more time to visualize a picture using wider wide angles, so it pays to put the camera on a tripod and take more time with each shot. As your lenses get wider, the effect of any slight tilt will be exaggerated, so it helps to use a spirit level. I think that one of the reasons why larger formats are more helpful in taking wider angles is that they require you to slow down and take more effort in visualizing before you take the picture. Of course, the larger formats also let you crop more easily, which can save some shots that might otherwise be circular filed.