The ease of navigation and use is what makes Salesforce Lightning superior to its predecessor. Salesforce Classic.
As well, the Lightning platform is much more visually aesthetic than Classic and as a result, it seems easier to navigate through all of its features.
The ability to drag and drop files is also a big convenience.
I've found that unlike Salesforce Classic, Salesforce Lightning tends to load quite a bit slower. As well, as it is a newer version of the platform, there are a lot of updates that are added that causes some of its features to often be "down" while the updates are made.
To maximize the ease of use I highly recommend utilizing the free Trailhead courses that Salesforce provides.
You can find this at https://trailhead.salesforce.com/
There you can learn all the ins and out of the platform and not just how to use it, but also how to create within it.
I use Salesforce Lightning on a daily basis as my company uses it to house all of our customers and their protection plans. I am able to view a customer's account, which has all their warranties attached to it, and under those warranties lives every claim that has been filed.
As well, we are able to communicate between departments as Salesforce gives us the ability to create tickets and assign them to different queues within the company. This ensures that all communication between the customer and our specialists, as well as within the company, is happily situated and easy to locate in the customer's account.