The sheet is great right up until it leaves the sheet
Nothing beats a grid for the build. You can drag a block, recalculate the getting ready window, and see the whole day at once. Most experienced coordinators have a template with tabs for the master schedule, the photo list, and the vendor contact sheet, and it works because it is theirs.
The break happens at export. Once the schedule becomes a PDF in fourteen inboxes, the document stops being live and starts being fourteen documents. The florist saved hers on Monday. The rental company printed one for the truck. The venue manager forwarded the one she had to her weekend staff. There is no way for you to see which version is on which counter.
Vendor filtered views change what people actually read
A full run of show can be sixty lines. A DJ needs perhaps twelve of them: sound check, cocktail hour, grand entrance, the toast order, cake, the anniversary dance, last call, last song. When you send all sixty, the DJ scans for the ones that matter and mentally drops the rest, which is exactly how a moved toast order gets missed.
Filtering by vendor is not a convenience feature, it is a comprehension fix. When a caterer opens a page that starts with the load in door, their staff meal time, and the doors open check, they read the whole thing. That is the difference between a schedule someone skimmed and a schedule someone is running.
When keeping the spreadsheet is the right call
If you coordinate six weddings a year, all at three venues you know, with a vendor list that barely changes, a spreadsheet plus a phone call is a perfectly good system. The cost of a change is one round of texts, and you will remember who you told.
The math flips as the season fills. Somewhere around ten to fifteen weddings, the number of vendor relationships passes what you can hold in your head, changes start arriving during other weddings, and the confirmation call cycle overlaps two dates at once. That is the point where a live version and automatic notices stop being nice and start paying for themselves.