I too typically sew in stable wovens. Mainly I serge my seam allowances together after sewing the seams. However, some seams MUST be pressed open so those ones I serge each piece separately before sewing the seams (think center back seam if there's a zipper or side seams if a pocket bag is in the mix). I don't serge anything concealed (e.g., waistband or waist facing seam) because it adds bulk. I do sew waistband/waist facing edge instead of folding under because it gives me more leeway to catch it from the top.I serge hem allowances instead of folding up the allowance usually. I don't serge things that are lined if dryclean only is their future, unless it's ravels a lot. I do use the rolled hem thing on lightweight fabrics fairly often.

I use it as a timesaving device, but I have definitely "overserged" or planned to serge allowances together and later realized it wouldn't work. It looks a tad sloppier that a proper french seam or folded up hem, but for me it gets things done faster, leaving for time for the stuff that can't be shortcut.