Others such as Eli Lily or the UK Gov Dept of Pensions really don't need so many addresses
Someone in the UK government pointed that out recently - it turns out that "Dept of Pensions" allocation is actually used across most of the government as some sort of VPN extranet with various external contractors. Apparently, since they all use different RFC1918 blocks internally, they can't all be VPNed into any single RFC1918 block: they needed a globally-unique block for that purpose.
British Telecom uses the 18.104.22.168/8 block for managing all their customer modems - that block is actually allocated to the US DoD, but they don't allow external access to it anyway, so there's nothing to stop you using that block internally yourself as long as you don't need to communicate with any other networks using the same trick. Better than wasting an entire
My inner geek - who cares about efficiency - would love to see all the legacy blocks revoked. I'm sure the DoD could use 10/8 instead of 30/8 quite easily for their non-routed block; the universities could easily fit in a