Your users shouldn't have to break their flow to use Atlassian systems. Needing to log into multiple systems is an obstacle that you can circumvent by using a variety of apps. In addition to the Single Sign On solutions, there are other tools that let you effectively manage your users and their rights.
Recommended apps
KANTEGA SSO
SAML SINGLESIGNON
EASY SSO
TERMS OF USE
2-FACTOR AUTH SECURE LOGIN
ENTERPRISE PASSWORD POLICY
Login and Single Sign On