Back before technology....
To research a trip, it meant going to the Library or a bookstore to peruse guidebooks. Some countries had visitors bureaus in the US one could visit or write to for information.. It was fun to get a package full of travel brochures.
When it was time to book things, you could go to an airline ticket office but mostly you visited a travel agent to book air, hotels, trains, tours, cruises, etc. A good one had experience and lots of brochures. Everything was issued in paper.
Today, all of that can be done on a smartphone. Not a piece of paper in sight.
Before, people could escort you to the gate to say goodbye or meet you as you exited the plane. Now, at some airports, they don't even want you inside the terminal unless you are a ticketed passenger.
While cheap flights across the Atlantic have been available since the 1970's --remember People's Express--flights within Europe were very expensive. Most people stayed in a small area while on vacation and used the train. Now you can travel from one end of Europe to another by air for the cost of a fast food meal. Theoretically.
American Express offices were everywhere to help not only plan things but to get local currency. Every country had its own. Cash was king. Now, personally, I've gone to some countries and not even gotten any of the local currency thanks to credit cards and Google Pay.
What else....
Film cameras and having to wait until you got home to get the film developed to see the photos.
Smoking was rampant.
Dealing with the overseas operator to call back home and it wasn't cheap.
Needing coins for pay toilets. (Now, many take contactless credit cards.)
Not everyone you dealt with in the travel industry spoke English. Now some speak better than me.