There are basic types of angel round - and different investors may work in one or more of these modes.
First, what you might call "find the angel." Here you are essentially looking at a single angel who wants to be your primary investor this stage. It's not uncommon for this individual to introduce co-investors, to share the financial risk or/and broaden out the skills/contacts brought to bear. This tends to come out of individual approaches or circulating pitches on broad-access sites.
Second, you may access a small 'choir' of angels. The start point here is often an angel network, and the end result a handful of investors from that network. We're talking a handful rather than a large number, and you can usually expect that one will act as the lead investor - so in terms of agreements this has a lot in common with the first scenario.
And finally, there's the full heavenly host! As we're on startups here, this isn't so likely to be the facebook-style product of a rolling snowball. So realistically, this is an extension of the '3F' round, for inexperienced or 'for fun' investors.
The issue in this latter case isn't that there are 'too many to deal with,' but that their individual voices aren't going to count for much in a later round, and as the latest round calls the shots, and no new investor likes long lists of unknown shareholders, their outcomes have a lot more downside than upside.