One feature that I miss a lot when switching from spotlight to Alfred is the native spotlight currency conversion introduced in Yosemite/El Capitan (not sure which). Right now I'm using a workflow called "conv", it works, but it's not as natural or as efficient as the spotlight's one. Using conv I need to now the exact currency names like "USD" or "BRL" so that I can do "conv 1000 usd brl", while on spotlight I can simply do "1000 dollars in real".
