The OP wants examples and criteria outside of algebraic geometry. Here's a way to get examples from algebraic combinatorics.

Let $A$ be a polynomial ring in $n$ variables over a field, and let $I$ be a monomial ideal. One may represent $I$ as the subset of the nonnegative orthant of $\mathbb R^n$ given by the exponents of monomials in $I$. Let $c(I)$ be the maximum among the dimensions of the compact faces of the convex hull of this subset of $\mathbb R^n$. Bivia-Ausina showed in a Communications in Algebra article from 2003 ("The analytic spread of monomial ideals") that in this context (and somewhat more generally for so-called *Newton non-degenerate ideals*), $\lambda(I) = c(I)+1$.

In particular, $I$ has maximal analytic spread if and only if some compact face of its Newton polyhedron has dimension $n-1$. This is a very easy criterion to check in low dimension, given a minimal generating set of monomials.

The smallest example I know of is $A=k[x,y]$ and $I=(xy^2, x^2y)$. Then the boundary of the Newton polyhedron consists of the vertical upward-pointing ray starting at $(1,2)$, the horizontal rightward-pointing ray starting at $(2,1)$, and the line segment between $(1,2)$ and $(2,1)$. The last of these is the lone compact face, and it has dimension $1$, whence the analytic spread is $2$, which is the dimension of $A$.