So, first let's preface this by saying we usually travel with 3-4 adults, 1-2 preteen/teens, my granddaughter (6), and 2 service dogs (lab/goldens, one hearing, one stability.) So we travel with bags, bags for dogs, crates, first aid kits, etc. (Usually the count is 15-17 bags.) We have a full suburban, sometimes, like this weekend, the suburban and a small suv.
OK, upon arrival, $5 to valet, usually $10 to the dude unloading the car onto baggage racks. The bellman who delivers our stuff usually gets $20-30, but he also separates the luggage for us (long story) and gets ice. During trip, things I left in the car that the valet runs out and gets (ie charging cables, batteries), $5. Upon departure, valet $5, bellman (he picks up and loads car, brings packages we bought during trip and returns the ECV) $20-30. ($50 at Christmas.) Worth it is a personal opinion. For me, this makes my daughter's and my lives easier, so it is definitely worth it. For others, they may not see value in it.