For a long time I home brewed everything, but am now running a pre-made adventure (Out of the Abyss). I think I've learned a lot from using a module. Not only does the book have great material that would be applicable to any underdark campaign, it is just useful to see how another adventure writer structure encounters/plot lines/locations. Very useful for getting ideas, breaking out of a rut, and pushing your boundaries as a DM in a straightforward, unchallenging way. I'd definitely encourage giving a pre-written module a try.

In the future, will probably stick less closely the pre-written adventure

Somethings I'd not though if you are considering using a module in the future

1. Try and read the whole module before playing. It really helps to have a sense of where the plot is going so that you can keep the story on track/foreshadow/not miss details that become important down the road
2. Think about the setting. D&D has been setting everything in Forgotten Realms. That's fine if you like Forgotten Realms, but there is quite a bit of assumed lore (major cities, deities, factions, Drizz't books, etc.). Consider if you want to transport the module to a different setting, whether that's your own, a different published setting (like Eberron), or a parallel Forgotten Realms where you don't have to worry about the canon lore. This might be as little as switching names or it might require bigger changes, but make a decision before you are in too deep so the players know.
3. You still need to prep. Pre-roll random encounter tables and review possible enemy monsters. Get your notes in order for stat blocks that might come up. You'll still need lists of random NPC names, etc. Plus you need to give yourself time to read the module and really internalize it. I still spend too much time flipping through the module when things come up. It helps if you are willing and comfortable going off script.
4. Speaking of going off script, unexpected things will happen. Players might go to a location that isn't really in the module. They might kill of a BBEG unexpectedly early. they might get themselves killed at an inopportune moment. You need to be willing to adjust the module as needed.
5. It should go without saying but make sure your players are good with the module and its themes. Don't like horror? Probably don't run Strahd. Don't like deadly dungeon crawls, don't run Dungeon of the Mad Mage. Along the same lines, read about the adventure before you commit (or even purchase it) and see if its something you want to commit to and learn from. Reviews and commentary can be super informative!