We dont use boeing procedures so far but ours are of course influenced by them. For several years now we select flaps first before we do the after start checklist (actually start checklist below the line) and is checked during the same checklist before we start moving. Stab trim is set as soon as we have a confirmed trim setting and mentioned and checked during preflight briefing and rechecked during the before takeoff checklist (as is the flap setting a second time).
Nevertheless it can and does sometimes happen that the wrong flap setting is used, as far as i know nobody managed to get airborne without any flaps set at all.
Winter operation is of course something different but we use a completely different checklist for that to double check a correct trim and flap setting as well.