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I always bother. To me, making clean models is not a trivial issue.
I don't know exactly what you mean by snapping to a grid. Being a slave to a grid isn't necessarily important, but making sure that buildings and props are touching the ground are.
Many times, you're not the only one who's ever going to touch a model. And if what you create isn't clean then it's going to cause problems for others down the road that have to work on what you created. Either that, or some QA tester to going to report a bug that you or someone else is going to have to fix. And it always takes more time to fix problems than to avoid them in the first place.
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What i mean by snap to grid is to have the model aligned in the orthographic viewports. The model on the left is properly aligned and all the vertices are snapped to the grid...while to model on the right is not
I insist on this as it is very frustrating for someone else to work on such models(like urs truely)...i understand that while doing organic modelling one need not and cannot use snapping, but in inorganic modelling why not use snapping as it makes the model nice and clean...