You have summed my feelings about it excellently. The other day I installed an app in Linux that logs my activities, such as documents opened and programs used, and indexes it into a searchable database ("I can't remember that pdf I was reading last weekend, let me get it"). The most jarring feeling about that was... that for once I wasn't not thinking how privacy invasive all that data collection was! I'm used to seeing programs and websites attempting to collect all sorts of nefarious data and trying my best to stop that collection (including not using the product at all). I was stunned how useful it was once I realised it was all local and serving my interests, not those of its manufacturer.