Some tools help with some aspects a modern artist has to engage with, some are a waste of time, and some can be damaging (as Lazz pointed out). Much relies upon using the right ones and using them effectively. To do that you also need to have a good idea of the overview of how things all fit together, how they interact, and how and when you interact with them.
For example:
Tools only work at their best when they work together within the context of an overall plan designed to make the most of them.
Questions to ask yourself:
Do you have set goals?
Have you identified a strategy?
Do you have a plan to take you from where you are now towards achieving those goals?
When you use tools, are you clear on how they interact, what the purpose is in using all those tools, and the pros and cons of using those tools?
Are you projecting the right image as an artist?
These are all useful questions to ask yourself. Most artists are short on both funds and time, because they push their band forward while they are either working or studying. Time management is important to success. To know whether you have the right tools, you have to have a clear idea of your goals, and how those tools help you to achieve those goals.
Goals give you direction.
Strategy helps you build your plan. It defines your overall approach.
Planning gives you the steps between where you are now and where you want to go.
Tools should be chosen because of their contribution towards implementing those steps.
All that is great, but projecting the right image makes a huge difference in how your fans and the general public see you. This too can affect the sites and tools you work woth.
For example:
Whenever and wherever the public encounter your music, do you think they would view you as a professional musician, or an amateur musician?
When you look at the sites / tools you intend to use is that site morse associated with amateur or professional musicians? Does the tool or site have a damaging effect on your music reputation.
Reputation is MUCH undervalued by musicians.
If you act like an amateur, you will be seen as an amateur
If you are seen as an amateur, people treat you like an amateur
People do not need to hear your music to view you as either professional or amateur.
This includes graphics, photos, website, buzz (chat), reviews, communications from you, communications about you etc.
There are few aspiring pro artists these days that would not incorporate the internet into their strategy. That means either you hire someone that knows about the internet and how to use it for music marketing, at the cutting edge, or you learn it yourself. The tools mainly work around either automating part of the process, or communications, or both.
Either way, tools are useful when you choose the right ones to achieve your goals. Without goals, strategy and a plan, tools become more and more of a waste of time.