Just got back from SIL's bridal shower. While it was not a BYO watermelon event (though they did pass out envelopes so we could pre-address our thank-yous....all the ILs do this and it makes me cringe a little every time....) they did so something I hadn't seen before at a shower. Instead of the bride-to-be opening her presents, she had the bridesmaids unwrap them and then pass them down to her unwrapped, so she would read the card and then just announce what the gift was and pass it to her other bridesmaids, assembly-line style. WDSAHMT? My first thought was "tacky".....actually, that's still my thought (and it provided for kind of an awkward mix-up when some of the gifts were piled together....I almost got to take credit for a cake-server I hadn't gotten them....) but on the other hand, it sure did speed along the present-opening part of the shower. Maybe this method could be adopted for kids' parties as a compromise between opening and not opening presents.....

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But yeah.....WDYT???
Re: S/O wedding/shower etiquette.....
I'm in the "tacky" vote club... Honestly, to me it sounds like Nosey Nellie bridesmaids who want to know what the bride got and "all about them" instead.
I get the "HUGE" showers, but really, I'd rather have a no gift opening engagement party/shower and let the bride do this at her own pace than the public gift openings, or set a time limit so guests aren't bored to tears for 4 hours. Then again - my family is HUGE, so letting the bride/couple open things at their own pace makes things so much easier for them too (whomever was doing the recording for our wedding did such a wonderful job that writing thank you notes was a NIGHTMARE - "Bowl" tells me NOTHING to remind me... or "knives" - when we got 72 steak knives it'd been helpful to know which ones - the $20 set from Fleet Farm or the $150 Wustoff set to be more specific!)...
See, at my showers I took the few moments while unwrapping the gifts to say a word or two about the person who had given it (not a whole story, just a "So-and-so is my friend from work, so-and-so came all the way from Canada to be here!" etc.) People told me afterwards that they liked that.....call me old-fashioned, but it was important to me to take a few extra seconds to ooh and aah and make the people feel special who had taken the time (and spent the $$) to be there for me.
With anything, I think the spirit in which something is done makes a huge difference. Like, if you can figure out how to streamline a present-opening process, nothing wrong w/ that in and of itself, but if it really comes off as "I don't want to deal with this" it's gonna cross into "tacky/less than gracious" territory.....
And, @spring_time.....I thought of that too! Now that you mention it, maybe she did it on purpose, after watching me break ribbons right and left and end up w/ twins by my first anniversary :P
Though I think now I'm going to start hosting BYOW parties.....