I am just curious to know, whether there are possibilities to import more than one project at the same time into Eclipse. Because whenever I create my new workspace I had to
There is an ongoing experiment of an easier and smarter import mechanism for Eclipse IDE. See https://wiki.eclipse.org/E4/UI/Smart_Import for details. Then you'll see new UI entries in File menu or Import wizard that will allow you to import projects recursively.
In case you notice any issue, please report bugs!
If all of your old projects exist in a single directory or in a single parent directory, you can do File -> Import... -> Existing Projects into workspace. Choose a root directory that is a parent all of the projects you want to import. You will then be able to import all of the projects at once.