Internet usage definitely help towards chalking out a travel plan. This is done with the help of data analysis by such companies like trivago and oyo which are basically aggregator companies. They have tie-ups with various hotels and take care of the spare inventory. This inventory is listed on their websites. Then there are websites like makemytrip which act as a synchronizer and ensure that the person gets best of the services be it travel, stay and sightseeing. All this is made possible with the help of ICT.
Internet is very helpful in planning your trip especially if you're traveling to a country you've not traveled to before. It helps you to become familiar with the transport system such as public transportation, time needed to go to places, cost of food and entering tourist attraction sights and the like. Moreover, if you have a long layover you can search the net to see what services the airport has such room to rent to sleep or even going out to the city.