Since its launch, Google Docs has often been criticized for its lack of maturity when compared to Microsoft Office. With major upgrades to Documents and Sheets, the gap has certainly closed quite a bit over the past 18 months.
This months, Google Slides takes a giant leap forward as well, with the addition of the Master Slide feature. With the ability to create a master template, specific to your presentation, you no longer need to edit common elements on every slide.
This video from Google provides and overview and demo.