Most of it is ok, but as I am always logged into multiple accounts at work, I am limited to amount of accounts I can see when trying to change between clients accounts...
Maybe as this is Analytics - not the accounts page etc - google could give more weight to the amount of space given for the number of ANALYTICS ACCOUNTS shown rather than giving more space to the amount of Google Accounts shown?!
Check my screenshot to see exactly what I mean - and no comments about my awesome paint work lol ;)
I usually have a separate (chrome private) window open for client accounts and have a database with the info easily accessible. I have seen a few apps and services designed to manage this for you but I haven't tried any of them out.