Chrome automatically creates these for me, though. Start typing imdb.com, once it starts autocompleting, hit tab, then type whatever I want to search. I only have to go search there once. I've been using firefox and DDG lately and I really miss this.
Down side to that feature is when you search a random blog once and then two years later it's suggesting you search there again.
Firefox supports something similar, if you for example visit IMDb you can add their search via the Firefox search box and then add a keyword of your choice to use the search in the address bar.
That sounds a lot like you're still creating each one yourself. Just because Chrome is suggesting that you might want to create a search shortcut, doesn't mean you're still making individual shortcuts by hand.
I can directly search Audible.com (a site I've never used before) with an intuitive !audible. Then I never have to think about this shortcut ever again, because it isn't saved in my browser somewhere.
Down side to that feature is when you search a random blog once and then two years later it's suggesting you search there again.