Needs analysis: without it, we are dead in the water, or, at best, taking a wild guess at what content is needed for training or re-training for our audience whether they are clients, students or our presentees.
There's no way to create an effective lesson plan or curriculum without knowing the needs of your audience. What's their technology experience? A lesson for a group of highly knowledgeable techies may be faster paced than if you're starting with an audience that's inexperienced with tech. If you know your audience well, such as a teacher who will have the same roster of students, then you won't need to perform a needs analysis for every lesson; however, if your audience is new to you OR you aren't sure who your target audience consists of (such as when you are presenting to a large group of attendees at a conference) then you may have to do your best to create a more general lesson and allow more time for your learners to understand your content and ask questions as they may be learning your content AND the technology used to create the content simultaneously.
The ADDIE model for curriculum development is a bit time consuming, yet thorough form of lesson planning. You're sure to have every detail covered for your next lesson when following the ADDIE model. If you've had many years of curriculum development and lesson planning then you may be able to speed the process up, just by practice alone.
Sure, there are simpler forms of lesson planning such as backward design (which I use most often when planning) but you can't beat ADDIE for making sure you've gone through the process. If you aren't familiar with how to plan a lesson or you are just getting your feet wet as an Instructional Designer, keep in mind that this process will take time to get the process done. You may need to redo a part or parts of the model in order to make the model flow better or to create an assessment that better suits the needs of the lesson.
In short, the ADDIE process is a bit longer process, but this method is arguably the most effective way to create engaging lessons, complete with assessments and, the most important component, reflection.
Because in the end, there's no point in creating a lesson unless you know how to create a better one!